A vessel is found to be seaworthy after a complaint in writing to the American Consul by the Chief and Second Mates. The cost of the survey is to be paid by the（）.

A.mine clearance operation
B.towing operation
C.dredging or surveying or underwater operation
D.fishing

A.vessel towing a submerged object
B.dredge underway and dredging
C.hydrographic survey vessel at anchor and surveying
D.None of the above

A.must be lighted
B.may have a flashing red light
C.may have a fixed white light
D.None of the above