67I3 A
 Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
A. Inmarsat-B terminals require AZ/EL setup and gyro input, in order to enable automatic satellite tracking.
B. Inmarsat-B terminals require gyro and GPS input, in order to enable automatic satellite tracking. 
C. Inmarsat-C terminals require only GPS input, in order to enable automatic satellite tracking.
D. Inmarsat-C terminals require AZ/EL setup and GPS input, in order to enable automatic satellite tracking.
