The operator of the ship's radiotelephone, if the radiotelephone is carried voluntarily, must hold at least which of the following?

Correct Answer: Option C — restricted radiotelephone operator permit

While voluntary, if a vessel chooses to carry a radiotelephone, the operator must hold at least a Restricted Radiotelephone Operator Permit (RR). This FCC requirement ensures that the person operating the radio possesses the basic knowledge of procedures and regulations necessary for safe and effective maritime communication.