With most Inmarsat-C systems what should the indicator lamps do when powering up?

Correct Answer: Option B — All lamps should illuminate in a particular sequence, as per the operator's manual.

Modern Inmarsat-C terminals perform a self-diagnostic routine upon power-up. This sequence typically involves illuminating indicator lamps to verify the integrity of the hardware and software. Operators must consult the specific manufacturer's manual to interpret the correct sequence, ensuring the terminal is functioning properly before attempting to log into the network.