Where would you find the “call sign” or “call letters”of the radio station on your rig?（）

A.Ship's Articles
B.Muster List ("Station Bill")
C.Certificate of Inspection
D.Coast Guard Regulations

A.With the Cargo Gear Register on the ship
B.In the Official Log
C.At the Coast Guard Marine Safety Office with the vessel's inspection records
D.At the central records center of the agency testing the cargo gear

A.Whenever its serviceability is in doubt
B.In accordance with the manufacturer's recommendation
C.At least once a month
D.All of the above