When Inmarsat-B and Inmarsat-C terminals are compared:

Correct Answer: Option C — Inmarsat-C antennas are smaller, with passive non-parabolic antennas but no rewind capability.

Inmarsat-C terminals utilize small, passive, omni-directional antennas that do not require mechanical tracking or 'rewind' capabilities. Conversely, Inmarsat-B systems use larger, active, directional parabolic antennas that must track the satellite, often requiring a cable-rewind mechanism to prevent damage during continuous rotation while maintaining a constant link.