根据标准航海通信用语,以下有关信文标识指示（INSTRUCTION）说法正确的是

根据标准航海通信用语,以下有关信文标识指示（INSTRUCTION）说法正确的是

A.THIS MEANS THAT THE SENDER, E.G. A VTS STATION OR A NAVAL VESSEL, MUST HAVE FULL AUTHORITY TO SEND SUCH A MESSAGE.

B.THIS INDICATES THAT THE FOLLOWING MESSAGE INFORMS OTHERS ABOUT IMMEDIATE NAVIGATIONAL ACTION INTENDED TO BE TAKEN.

C.THE RECIPIENT HAS TO FOLLOW THIS LEGALLY BINDING MESSAGE UNLESS HE/SHE HAS CONTRADICTORY SAFETY REASONS WHICH THEN HAVE TO BE REPORTED TO THE SENDER.

D.THIS INDICATES THAT THE FOLLOWING MESSAGE IMPLIES THE INTENTION OF THE SENDER TO INFLUENCE OTHERS BY A RECOMMENDATION.

正确答案是ACD