After establishing contact with a Coast Station on an available channel, which of the following exchanges take place?

Correct Answer: Option C — After exchanging answer-backs (WRU/AAB) the coast station transmits GA+?.

Once the radio link is established and the automatic exchange of answerbacks (WRU/AAB) confirms the identity of both stations, the coast station transmits the "GA+?" (Go Ahead) prompt. This signal indicates the shore system is ready to receive commands or traffic from the vessel, signaling the transition to the operational phase.