Please answer the following question: Information:  - Algeciras  is a port city in the south of Spain, and is the largest city on the Bay of Gibraltar (in Spanish, the "Bahía de Algeciras"). The Port of Algeciras is one of the largest ports in Europe and in the world in three categories: container, cargo and transhipment. It is situated 20 km north-east of Tarifa on the Río de la Miel, which is the southernmost river of the Iberian peninsula and continental Europe. In 2015, it had a population of 118,920.  - The auxiliary ship Olterra was a 5,000 ton Italian tanker scuttled by her own crew at Algeciras in the Bay of Gibraltar on 10 June 1940 , after the entry of Italy in World War II. She was recovered in 1942 by a special unit of the Decima Flottiglia MAS to be used as an undercover base for manned torpedoes in order to attack Allied shipping at Gibraltar .  - The Holocaust (from the Greek ': "hólos", "whole" and "kaustós", "burnt"), also referred to as the Shoah"' (Hebrew: , "HaShoah", "the catastrophe"), was a genocide in which Adolf Hitler's Nazi Germany and its collaborators killed about six million Jews. The victims included 1.5 million children and represented about two-thirds of the nine million Jews who had resided in Europe. Some definitions of the Holocaust include the additional five million non-Jewish victims of Nazi mass murders, bringing the total to about 11 million. Killings took place throughout Nazi Germany, German-occupied territories, and territories held by allies of Nazi Germany.  - The Río de la Miel is a short river in the south of Spain, emptying into the Bay of Gibraltar at Algeciras. It falls over a distance of 350 metres including some waterfalls and working water mills. As the port of Algeciras expanded, docks on the river became marooned inland, and within the town much of the river is now culverted.  - The United States dropped nuclear weapons on the Japanese cities of Hiroshima and Nagasaki on August 6 and 9, 1945, respectively, during the final stage of World War II. The United States had dropped the bombs with the consent of the United Kingdom as outlined in the Quebec Agreement. The two bombings, which killed at least 129,000 people, remain the only use of nuclear weapons for warfare in history.  - The Mediterranean Sea (pronounced ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Southern Europe and Anatolia, on the south by North Africa, and on the east by the Levant. The sea is sometimes considered a part of the Atlantic Ocean, although it is usually identified as a separate body of water.  - The Iberian Peninsula , also known as Iberia , is located in the southwest corner of Europe. The peninsula is principally divided between Portugal and Spain, comprising most of their territory. It also includes Andorra and a small part of France along the peninsula's northeastern edge, as well as Gibraltar on its south coast, a small peninsula which forms an overseas territory of the United Kingdom. With an area of approximately , it is the second largest European peninsula, after the Scandinavian.  - The Decima Flottiglia MAS (Decima Flottiglia Mezzi d'Assalto, also known as La Decima or Xª MAS) (Italian for "10th Assault Vehicle Flotilla") was an Italian commando frogman unit of the "Regia Marina" (Italian Royal Navy) created during the Fascist regime.  - World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier. It involved the vast majority of the world's nationsincluding all of the great powerseventually forming two opposing military alliances: the Allies and the Axis. It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries. In a state of "total war", the major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, erasing the distinction between civilian and military resources. Marked by mass deaths of civilians, including the Holocaust (in which approximately 11 million people were killed) and the strategic bombing of industrial and population centres (in which approximately one million were killed, and which included the atomic bombings of Hiroshima and Nagasaki), it resulted in an estimated 50 million to 85 million fatalities. These made World War II the deadliest conflict in human history.  - Hiroshima is perhaps best known as the first city in history to be targeted by a nuclear weapon when the United States Army Air Forces (USAAF) dropped an atomic bomb on the city (and later on Nagasaki) at 8:15 a.m. on August 6, 1945, near the end of World War II.  - Spain, officially the Kingdom of Spain, is a sovereign state largely located on the Iberian Peninsula in southwestern Europe, with two large archipelagos, the Balearic Islands in the Mediterranean Sea and the Canary Islands off the North African Atlantic coast, two cities Ceuta and Melilla in the North African mainland and several small islands in the Alboran Sea near the Moroccan coast. Its mainland is bordered to the south and east by the Mediterranean Sea except for a small land boundary with Gibraltar; to the north and northeast by France, Andorra, and the Bay of Biscay; and to the west and northwest by Portugal and the Atlantic Ocean. It is the only European country to have a border with an African country (Morocco) and its African territory accounts for nearly 5% of its population, mostly in the Canary Islands but also in Ceuta and Melilla.  - Tarifa is a small town in the province of Cádiz, Andalusia, on the southernmost coast of Spain. It is primarily known as one of the world's most popular destinations for wind sports. The town is located on the Costa de la Luz ("coast of light") and across the Straits of Gibraltar facing Morocco.  - During World War II, the American atomic bombings of Hiroshima and Nagasaki made Nagasaki the second and, to date, last city in the world to experience a nuclear attack.  - The Rock of Gibraltar (Spanish and Llanito: El Peñón de Gibraltar, sometimes called by its original Latin name, Calpe) is a monolithic limestone promontory located in the British overseas territory of Gibraltar, near the southwestern tip of Europe on the Iberian Peninsula. It is high. The Rock is Crown property of the United Kingdom, and borders Spain. Most of the Rock's upper area is covered by a nature reserve, which is home to around 300 Barbary macaques. These macaques, as well as a labyrinthine network of tunnels, attract a large number of tourists each year.  - The Bay of Gibraltar (also known as Gibraltar Bay or Bay of Algeciras) is a bay at the southern end of the Iberian Peninsula. It is around long by wide, covering an area of some , with a depth of up to in the centre of the bay. It opens to the south into the Strait of Gibraltar and the Mediterranean Sea.  - The Port of Algeciras is the port and harbour of Algeciras, a city located in the province of Cádiz in the autonomous community of Andalusia, Spain. It is a commercial, fishing and passenger port. It consists of numerous maritime infrastructures scattered throughout the Bay of Gibraltar. Although only the town of Algeciras and La Linea de la Concepción overlook the bay, there are port facilities in the rest of the bank, also belonging to the municipalities of San Roque and Los Barrios. It is managed by the Port Authority of Algeciras Bay near the port of Tarifa.  - The Royal Navy (Italian: Regia Marina) was the navy of the Kingdom of Italy ("Regno d'Italia") from 1861 to 1946. In 1946, with the birth of the Italian Republic ("Repubblica Italiana"), the Royal Navy changed its name to Military Navy ("Marina Militare").  - Gibraltar is a British Overseas Territory located on the southern end of the Iberian Peninsula. It has an area of and shares its northern border with Spain. The Rock of Gibraltar is the major landmark of the region. At its foot is a densely populated city area, home to over 30,000 Gibraltarians and other nationalities.  - The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by the English kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years War against the kingdom of France. The modern Royal Navy traces its origins to the early 16th century; the oldest of the UK's armed services, it is known as the Senior Service.    After reading the paragraphs above, we are interested in knowing the entity with which 'italian auxiliary ship olterra' exhibits the relationship of 'operator'. Find the answer from the choices below.  Choices: - germany  - italy  - kingdom of italy  - nazi germany  - portugal  - regia marina  - royal navy  - southern  - spain  - united kingdom  - united states army  - united states army air forces  - world war ii
A:
regia marina