Which action should be taken once the vessel is berthed and will not leave port again for several weeks?

A
The GMDSS Radio Operator must notify the NCS that the vessel will be off-line.
B
The INMARSAT-C system can be powered down without taking additional steps once the GMDSS Radio Operator has ensured that all incoming SafetyNET messages have been received and stored.
C
THe GMDSS Radio Operator must log off of the INMARSAT system.
D
The GMDSS Radio Operator must transmit an all-ships alert to notify all vessels within the satellite's foot print that the vessel will be off-line.
E