Information:  - Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of , and has a largely temperate seasonal climate. With about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular immigration destination in the world. Germany's capital and largest metropolis is Berlin. Other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart and Düsseldorf.  - Western Europe, also West Europe, is the region comprising the western part of the European continent. There may be differences between the geopolitical and purely geographic definitions of the term.  - The Netherlands  is the main constituent country of the Kingdom of the Netherlands. It is a densely populated country located in Western Europe with three island territories in the Caribbean. The European part of the Netherlands borders Germany to the east, Belgium to the south, and the North Sea to the northwest, sharing maritime borders with Belgium, the United Kingdom, and Germany. The largest cities in the Netherlands are Amsterdam, Rotterdam, The Hague and Utrecht. Amsterdam is the country's capital, while The Hague holds the Dutch seat of government and parliament. The name "Holland" is used to refer informally to the whole of the country of the Netherlands.  - Brussels, officially the Brussels-Capital Region, is a region of Belgium comprising 19 municipalities, including the City of Brussels which is the capital of Belgium. The Brussels-Capital Region is a part of both the French Community of Belgium and the Flemish Community, but is separate from the region of Flanders (in which it forms an enclave) or Wallonia. The region has a population of 1.2 million and a metropolitan area with a population of over 1.8 million, the largest in Belgium.  - Telindus was a legal entity based in Belgium that offered ICT services and solutions to the corporate and public sector, both in Belgium and internationally. These solutions also contained management and support services in relation to their ICT contracts.  - Luxembourg, officially the Grand Duchy of Luxembourg, is a landlocked country in western Europe. It is bordered by Belgium to the west and north, Germany to the east, and France to the south. Its capital, Luxembourg City, is, together with Brussels and Strasbourg, one of the three official capitals of the European Union and the seat of the European Court of Justice, the highest juridical authority in the EU. Its culture, people and languages are highly intertwined with its neighbors, making it essentially a mixture of French and Germanic cultures. The repeated invasions by its neighbor countries, especially in World War II, resulted in the country's strong will for mediation between France and Germany and led to the foundation of the European Union.  - The High Fens , which were declared a nature reserve in 1957, are an upland area, a plateau region in the province of Liège, in the east of Belgium and adjoining parts of Germany, between the Ardennes and the Eifel highlands. The High Fens are the largest nature reserve or park in Belgium, with an area of ; it lies within the German-Belgian natural park "Hohes Venn-Eifel", in the Ardennes. Its highest point, at above sea level, is the Signal de Botrange near Eupen, and also the highest point in Belgium. A tower high was built here that reaches above sea level. The reserve is a rich ecological endowment of Belgium covered with alpine sphagnum raised bogs (not "fens" as the name would imply) both on the plateau and in the valley basin; the bogs, which are over 10,000 years old, with their unique subalpine flora, fauna and microclimate, are key to the conservation work of the park.  - Belgium , officially the Kingdom of Belgium, is a sovereign state in Western Europe bordered by France, the Netherlands, Germany, Luxembourg, and the North Sea. It is a small, densely populated country which covers an area of and has a population of about 11 million people. Straddling the cultural boundary between Germanic and Latin Europe, Belgium is home to two main linguistic groups: the Dutch-speaking, mostly Flemish community, which constitutes about 59% of the population, and the French-speaking, mostly Walloon population, which comprises 41% of all Belgians. Additionally, there is a small group of German-speakers who live in the East Cantons located around the High Fens area, and bordering Germany.  - Belgians are the citizens and natives of the Kingdom of Belgium, a federal state in Western Europe.  - Proximus , also known as Belgacom Mobile , was the name of the largest of Belgium 's three mobile telecommunications companies and is now used as the parent company name ( Proximus Group , previously Belgacom Group ) . It competes with Mobistar , owned by Orange S.A. , and BASE , a subsidiary of Medialaan . Proximus has a Euronext listing ( Euronext : PROX ) .  - France, officially the French Republic, is a country with territory in western Europe and several overseas regions and territories. The European, or metropolitan, area of France extends from the Mediterranean Sea to the English Channel and the North Sea, and from the Rhine to the Atlantic Ocean. Overseas France include French Guiana on the South American continent and several island territories in the Atlantic, Pacific and Indian oceans. France spans and had a total population of almost 67 million people as of January 2017. It is a unitary semi-presidential republic with the capital in Paris, the country's largest city and main cultural and commercial centre. Other major urban centres include Marseille, Lyon, Lille, Nice, Toulouse and Bordeaux.  - The Proximus Group (previously known as Belgacom Group) is the largest telecommunications company in Belgium, headquartered in Brussels. Proximus Group is primarily state owned, with the Belgian state holding 53.3% + 1 share. Proximus Group offerings include fixed line and mobile communications through the Proximus brand and ICT services to the professional market under the Telindus brand.    Given the paragraphs above, decide what entity has the relation 'headquarters location' with 'brussels'.
Answer:
proximus