【单选题】Which action is the most appropriate action for a GMDSS 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 HF/MF/VHF DSC or Inmarsat MES.
C.
Notify the RCC through VHF on Cbannel 11.
D.
Transmit distress call by activating the radiotelegraph automatic alarm signal.