On an Inmarsat-C system, soon after power up, what might a blinking lamp indicate?

Correct Answer: Option D — All of the above

Blinking indicators on an Inmarsat-C terminal serve as status alerts for the operator. These may signify that the terminal is still attempting to synchronize with the NCS, or that incoming data such as EGC SafetyNET messages or private mail is currently being received and stored by the system's memory.