Question 1438 Deck General

The correct answer is D) all valves used during transfer shall be closed. U.S. regulations require that upon completion of oil transfer operations, all valves used during the transfer must be closed. This ensures that no further oil can inadvertently be discharged from the system. The other answer choices are not specifically required by U.S. regulations - while accounting for personnel, recording soundings, and blowing down hoses may be good safety practices, they are not mandatory requirements upon completion of the transfer.