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

Both Inmarsat-B and Inmarsat-C systems are designed for satellite communication and have distinct capabilities. Inmarsat-B terminals are known for providing voice communication, fax, and broadband data services, which allow them to send various types of data as well. On the other hand, Inmarsat-C terminals, while offering more limited bandwidth, are capable of sending and receiving data messages, as well as transmitting to fax machines. This feature enables users to send data, including text and messaging, efficiently.

Therefore, the correct statement highlights that both Inmarsat-B and Inmarsat-C units can indeed send data and communicate with fax machines. This comprehensive communication capability makes both systems valuable for maritime operations and other remote communications where conventional systems are unavailable.

The other options misrepresent the capabilities of these systems. Some imply limitations in communication types or suggest functions that are not accurate for either system, which is why they do not correctly describe the functions of Inmarsat-B and Inmarsat-C terminals.