Fire protection regulations for towing vessels allow all of these types of fuel piping，EXCEPT（）.

A.used only for pollution response
B.owned and operated by the US government
C.used only within a barge fleeting area
D.used only on inland waters

A.receive a safety orientation or view a videotape before the vessel gets underway
B.view a videotape on safety procedures within 48 hours of reporting for duty
C.receive a safety orientation within 24 hours of reporting for duty
D.none of the above

A.Conduction of heat to adjacent surfaces
B.Direct radiation
C.Convection
D.All of the above