Which of the following statements concerning COSPAS-SARSAT is true?

Correct Answer: Option D — All of the above.

COSPAS-SARSAT satellites in polar orbit detect 406 MHz EPIRB signals and relay them to ground-based Local User Terminals. The system uses the Doppler frequency shift caused by the satellite's motion relative to the beacon to accurately calculate the distress location, facilitating rapid search and rescue intervention.