Which statement below is not true?

Which statement below is not true?

A.Shortening the aircraft call sign reduces the amount of air time needed for further transmissions

B.The controller may not shorten the call sign of an aircraft if there are other aircraft nearby with a similar call sign

C.It is the controller who can initiate to use the shortened aircraft call sign

D.Either the pilot or controller can initiate to shorten the aircraft call sign

正确答案是D