30E4 C
 Which of the following statements concerning COSPAS-SARSAT is false?
A. EPIRBs, ELTs, and PLBs use the system primarily for Distress alerting. 
B. These satellites monitor 406 MHz for EPIRB signals. 
C. After initiating a call request and selecting the LES, these satellites may be used for commercial messages. 
D. These satellites use Doppler shift measurement to determine the location of the beacons. 
