A vessel is experiencing problems tracking the satellite in an Inmarsat-C SES. The problem could be:

Correct Answer: Option D — All of these

Inmarsat-C is a store-and-forward system sensitive to signal degradation. Heavy precipitation causes rain fade, physical obstacles cause shadowing, and operating at the edge of the satellite's footprint reduces signal-to-noise ratios. Any of these conditions can disrupt the tracking process and prevent successful data transmission or reception.