Which characters are sent by the ship station when operating HF TELEX, to indicate a desire to send an AMVER message?

Correct Answer: Option C — AMV+

AMV+ is the specific command string used in HF TELEX to initiate an AMVER (Automated Mutual-Assistance Vessel Rescue) report. By transmitting this sequence, the ship station informs the automated coast station that the subsequent data transmission is intended for the AMVER system database.