问题详情

What is the basic concept of GMDSS？
A.Search and rescue authorities shore can be alerted to a distress situation
B.shipping in the immediate vicinity of a ship in distress will be rapidly alerted
C.Shore-side authorities and vessels can assist in a coordinated SAR operation with minimum delay
D.All of these请帮忙给出正确答案和分析，谢谢！