Which statement is TRUE concerning a vessel equipped with operat

Which statement is TRUE concerning a vessel equipped with operational radar? ________.

A.The Master of the vessel must be on the bridge when the radar is in use

B.The radar equipment is only required to be used in restricted visibility

C.The use of a radar excuses a vessel from the need of a look-out

D.This equipment must be used to obtain early warning of risk of collision

正确答案是D