What is the most appropriate action for a GMDSS radio operator to take in a distress situation where immediate help is needed, but the vessel is not sinking nor needs to be abandoned?

A
Switch off EPIRB and SART manually.
B
Transmit distress call by HV/MV/VHF or INMARSAT.
C
Notify the RCC (Rescue Coordination Center) through VHF FM on channel 13.
D
Transmit distress call by activating the radiotelegraph automatic alarm signal.
E