Distress traffic（）all messages relating to the immediate assistance required by the ship in distress, including search and rescue communications and signals for locating.

A.consists of

B.is consisted of

C.consisted of

D.are consisted of

在七号信令系统传送中准直联方式是指：两个信令点之间通过直达信令链路传递消息，话路和信令链路平行。