A towing vessel’s fire detection system may be certified to comply with the Coast Guard’s towing vessel fire protection regulations by（）.

A.shown below the stern light
B.white in color
C.displayed at the masthead
D.a yellow light having the same characteristics as the stern light

A.shown at the bow
B.white in color
C.shown in addition to the stern light
D.an all-round light

A.tug's engineroom or the bow
B.pilot house or aft steering station
C.forecastle
D.towing bitts by reaching over and releasing a lever