Answer the following question: Information: - Incheon International Airport (IIA) (sometimes referred to as SeoulIncheon International Airport) is the largest airport in South Korea, the primary airport serving the Seoul Capital Area, and one of the largest and busiest airports in the world. Since 2005, it has been rated the best airport worldwide by Airports Council International every year. It is also rated as the world's cleanest airport and the world's best international transit airport by Skytrax. - Unseo Station is a railway station on AREX . Unseo - dong is the site of Airport Town Square ( ) , a relatively new town with hotels and other facilities for those going to or coming from Incheon International Airport . It takes 47 minutes to get to Seoul Station from Unseo Station . There is a large forecourt outside the station with seats and bicycle racks and there are usually taxis there . You need only to walk one block from the station to find the restaurants , and if you look left Lotte Mart ( supermarket ) is not hard to miss. Lotte Mart has a food court on the 2nd floor if you need a quick meal . When coming back to Unseo from Seoul , make sure you get the train that goes all the way to the airport , as the other one terminates one stop earlier in Geomam . There will be a sign in English and Korean at Seoul Station . There are hotels / motels in Unseo and one near the station ( go to the intersection and turn right ) . Unseo is two stops ( 8 minutes ) from Incheon International Airport . - Incheon (formerly romanized as Inchon; literally "kind river"), officially the Incheon Metropolitan City(), is a city located in northwestern South Korea, bordering Seoul and Gyeonggi to the east. Inhabited since the New Stone Age, Incheon was home to just 4,700 people when it became an international port in 1883. Today, about 3 million people live in the city, making it Koreas third most populous city after Seoul and Busan. The city's growth has been assured in modern times with the development of its port due to its natural advantages as a coastal city and its proximity to the South Korean capital. It is part of the Seoul Capital Area, along with Seoul itself and Gyeonggi Province, forming the world's second largest metropolitan area by population. - AREX(Airport Railroad Express), spelled "A'REX" as a brand name, is a South Korean commuter rail line that links Seoul with Gimpo Airport and Incheon International Airport. The section between the two airports opened on March 23, 2007, the extension to Seoul Station opened December 29, 2010. After reading the paragraphs above, we are interested in knowing the entity with which 'unseo station' exhibits the relationship of 'date of official opening'. Find the answer from the choices below. Choices: - 1883 - 2005 - 2007
Answer:
2007