67I5 B
 Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
A. Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects due to their omni-directional antennas. 
B. Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-B units have directional antennas. 
C. Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-C units have directional antennas. 
D. Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, due to their directional antennas. 
