Information:  - Mount Rushmore National Memorial is a sculpture carved into the granite face of Mount Rushmore, a batholith in the Black Hills in Keystone, South Dakota, United States. Sculpted by Gutzon Borglum and his son, Lincoln Borglum, Mount Rushmore features sculptures of the heads of four United States presidents: George Washington (17321799), Thomas Jefferson (17431826), Theodore Roosevelt (18581919), and Abraham Lincoln (18091865). The memorial park covers and is above sea level.  - Wyoming is a state in the mountain region of the western United States. The state is the tenth largest by area, the least populous and the second least densely populated state in the country. Wyoming is bordered on the north by Montana, on the east by South Dakota and Nebraska, on the south by Colorado, on the southwest by Utah, and on the west by Idaho. Cheyenne is the capital and the most populous city in Wyoming, with a population estimate of 63,335 in 2015. The state population was estimated at 586,107 in 2015, which is less than the population of 31 of the largest U.S. cities.  - The Territory of Dakota was an organized incorporated territory of the United States that existed from March 2, 1861, until November 2, 1889, when the final extent of the reduced territory was split and admitted to the Union as the states of North and South Dakota.  - The Sioux are groups of Native American tribes and First Nations peoples in North America. The term can refer to any ethnic group within the Great Sioux Nation or to any of the nation's many language dialects. The Sioux comprise three major divisions based on language divisions: the Dakota, Lakota, and Nakota.  - The South Dakota Department of Transportation is a state government organization in charge of maintaining public roadways of the U.S. state of South Dakota. South Dakota has 82,447 miles of highways, roads and streets; 5,905 bridges. The SD DOT is responsible for 7,830 miles of the roadway system.  - U.S. Route 16A ( US 16A ) is a scenic United States highway , which divides from U.S. Route 16 in the Black Hills of South Dakota . The highway 's western terminus is a junction with US 16 and US 385 in Custer , South Dakota . The eastern terminus is at an interchange with US 16 called the Keystone Wye south of Rapid City , South Dakota .  - A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population. The term is used mostly in connection with national population and housing censuses; other common censuses include agriculture, business, and traffic censuses. The United Nations defines the essential features of population and housing censuses as "individual enumeration, universality within a defined territory, simultaneity and defined periodicity", and recommends that population censuses be taken at least every 10 years. United Nations recommendations also cover census topics to be collected, official definitions, classifications and other useful information to co-ordinate international practice.  - Camp Rapid is a South Dakota Army National Guard installation located in Westside, Rapid City, South Dakota just inside the edge of the Black Hills. Although the South Dakota state capital is Pierre, South Dakota, the state's Adjutant General has his office and headquarters in Camp Rapid. Background. Camp Rapid developed as a summer encampment site for the South Dakota National Guard in the early 20th Century, using land borrowed from the Bureau of Indian Affairs "Sioux Sanitorium" and Rapid City Indian School, today's Indian Health Service (IHS) SiouxSan Hospital, located just west of Camp Rapid. It became a permanent installation during and immediately after World War I, when it was used for mobilization of National Guard units for the front in France. Its use continued during the 1920s and 1930s, and it was taken over as a federal installation during World War II. Permanent and temporary buildings erected during World War II continue in use today.  - Ellsworth Air Force Base (AFB) is a United States Air Force base located approximately northeast of Rapid City, South Dakota just north of Box Elder, South Dakota.  - The Great Plains is the broad expanse of flat land (a plain), much of it covered in prairie, steppe and grassland, that lies west of the Mississippi River tallgrass prairie states and east of the Rocky Mountains in the United States and Canada. This area covers parts, but not all, of the states of Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming, Minnesota, Iowa and the Canadian provinces of Alberta, Manitoba and Saskatchewan. The region is known for supporting extensive cattle ranching and dry farming.  - A county seat is an administrative center, seat of government, or capital city of a county or civil parish. The term is used in the United States, Canada, Romania, China and Taiwan. In the United Kingdom and Ireland, county towns have a similar function.  - Black Hills National Forest is located in southwestern South Dakota and northeastern Wyoming. The forest has an area of over 1.25 million acres (5,066 km²) and is managed by the Forest Service. Forest headquarters are located in Custer, South Dakota. There are local ranger district offices in Custer, Rapid City, and Spearfish in South Dakota, and in Sundance, Wyoming.  - Keystone Wye is an interchange of US 16 and US 16A located in the Black Hills of South Dakota, featuring two unique structural glued laminated timber bridges. The Keystone Wye is a trumpet-style three-way interchange for the two divided highways, constructed in 1966-67 as part of a project by the South Dakota Department of Transportation (SDDOT) to convert US 16 to a four-lane highway between Rapid City and Keystone. It was designed by Clyde Jundt.  - Custer is a city in Custer County, South Dakota, United States. The population was 1987 at the 2010 census. It is the county seat of Custer County.  - The Black Hills are a small, isolated mountain range rising from the Great Plains of North America in western South Dakota and extending into Wyoming, United States. Black Elk Peak, which rises to , is the range's highest summit. The Black Hills encompass the Black Hills National Forest. The name "Black Hills" is a translation of the Lakota ". The hills were so-called because of their dark appearance from a distance, as they were covered in trees.  - South Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux Native American tribes, who compose a significant portion of the population and historically dominated the entire territory. South Dakota is the 17th most expansive, but the 5th least populous and the 5th least densely populated of the 50 United States. Once the southern portion of the Dakota Territory, South Dakota became a state on November 2, 1889, simultaneously with North Dakota. Pierre is the state capital and Sioux Falls, with a population of about 171,000, is South Dakota's largest city.  - Rapid City ("Swift Water City") is the second-largest city in South Dakota (after Sioux Falls) and the county seat of Pennington County. Named after Rapid Creek, on which the city is established, it is set against the eastern slope of the Black Hills mountain range. The population was 67,956 as of the 2010 Census. Known as the "Gateway to the Black Hills" and the "City of Presidents", it is split by a low mountain ridge that divides the western and eastern parts of the city. Ellsworth Air Force Base is located on the outskirts of the city. Camp Rapid, a part of the South Dakota Army National Guard, is located in the western part of the city. The historic "Old West" town of Deadwood is nearby. In the neighboring Black Hills are the popular tourist attractions of Mount Rushmore, the Crazy Horse Memorial, Custer State Park, and Wind Cave National Park.    After reading the paragraphs above, we are interested in knowing the entity with which 'u.s. route 16a' exhibits the relationship of 'owned by'. Find the answer from the choices below.  Choices: - city  - idaho  - lincoln  - minnesota  - montana  - refer  - sioux falls  - south dakota department of transportation  - split  - texas  - united kingdom  - united nations  - united states air force
A:
south dakota department of transportation