What is the primary purpose for Digital Selective Calling (DSC)?

A
DSC provides reception of weather and navigational warnings plus search and rescue information.
B
DSC provides low-cost, routine communications for the vessel operator.
C
DSC is to be used for transmitting and receiving distress alerts to and from other ships or coast radio stations via radio.
D
This aids SAR authorities in tracking a vessel's position by satellite.
E