Which of the following is the minimum license requirement of a GMDSS Radio Operator?

Correct Answer: Option C — Holding a valid GMDSS Radio Operator license is sufficient.

FCC 47 CFR Part 80 regulations establish the GMDSS Radio Operator license as the primary credential for operating GMDSS-equipped vessels. No additional permits or endorsements are required for the operator to legally perform their duties, as this license specifically validates the holder's competency in GMDSS equipment and procedures.