What is the responsibility of vessels under GMDSS?

Correct Answer: Option C — Every ship is able to perform those communications functions that are essential for the safety of the ship itself and of other ships.

SOLAS Chapter IV requires that every GMDSS-equipped ship maintains the capability to perform essential safety communications. This includes distress alerting, receiving maritime safety information, and bridge-to-bridge communications. These functions are mandatory to ensure the safety of the vessel itself and to provide necessary assistance to other ships in distress.