Which functions may the holder of a GMDSS Radio Operator License perform on the Inmarsat-C equipment?

Correct Answer: Option D — All of these

GMDSS Radio Operators are authorized to perform routine operational tasks on Inmarsat-C terminals. This includes logging on and off the network, managing traffic, selecting Coast Earth Stations (CES), and performing basic maintenance like keeping the antenna radome clean of debris, paint, or soot to ensure optimal signal propagation.