Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?

Correct Answer: Option B — Both Inmarsat-B and Inmarsat-C units can send data as well as send messages to fax machines.

Both Inmarsat-B and Inmarsat-C terminals are capable of interfacing with external networks to send data and messages to fax machines. While their underlying technologies and bandwidth capacities differ significantly, both systems provide the necessary gateways to transmit text-based information to terrestrial fax and e-mail destinations.