7-66I1 D
 Which of the following best describes Inmarsat-C operation?
A. Is an analog-based system.
B. Requires a stabilized directional antenna.
C. Provides for voice, TELEX, high and low-speed data and compressed video communications.
D. Is a digital store-and-forward system that also provides Enhanced Group Call, data reporting, polling and Distress alerting capabilities.
