Which of the Following Contracts Would Be Considered a Long-Term

Which of the following contracts would be considered a long-term contract?

A) A contract signed on September 1 with the U.S.Army to manufacture 20 planes estimated to be completed in 15 months (a single plane takes about one month to complete) ; the contractor currently has 12 planes in inventory.
B) A contract to manufacture a telescope custom-made for space flight.The telescope will be the first of its kind.Estimated time of manufacturing is eight months.
C) A three-year contract signed by JB Systems to provide the design work for the space shuttle.
D) More than one of the above.