Please answer the following question: Write a multi-choice question for the following article: Article: One mile long runway can take people across the oceans, to reach every corner of the world. That's the magic power of airplanes as well as airports. Similar as most airports are, some do have their unique features. Lukla Airport Lukla Airport, is a small airport in the town of in the town of Lukla, eastern Nepal. A program titled Most Extreme Airports, rated the airport as the most dangerous airport in the world. The airport is popular because Lukla is the place where most people start the climb to Mount Everest Base Camp. High wind, cloud cover, and changing visibility often mean flights can be delayed or the airport closed. The airport's runway is accessible only to helicopters and small, fixed-wing, short-takeoff-and-landing aircraft. The runway is only 527m with an elevation of 2,845m. Princess Juliana International Airport Princess Juliana International Airport is in the country of Saint Maarten. The airport is perhaps best known for very low-altitude flyover landing approaches due to one end of its runway being extremely close to the shore and Maho Beach. The thrilling approaches and ease of access for shooting spectacular images make the airport one of the world's favorite places among plane spotters. Gibraltar Airport Gibraltar Airport serves the British overseas territory of Gibraltar, a tiny peninsula with an area of only 6.8 square kilometers. The lack of flat space there means the peninsula's only runway is bisected by its busiest road, the Winston Churchill Avenue that heads towards the land border with Spain. It is really scary that there is a four lane highway passing through the middle of the runway! Kai Tak Airport Kai Tak Airport was officially known as Hong Kong International Airport from 1954 to 6 July 1998, when it was closed and replaced by the new one at Chek Lap Kok, 30 kms to the west. With numerous skyscrapers and mountains located to the north and its only runway jutting out into Victoria Harbour, landing at the airport were dramatic to experience and technically demanding for...
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Question: Which of these airports is out of business now?Options:A Lukla AirportB Princess Juliana International AirportC Gibraltar AirportD Kai Tak AirportAnswer:D