Which of the following operations aboard a tanker must be recorded in the Oil Record Book on a tank-to-tank basis according to Coast Guard Regulations?

Correct Answer: Option D — All of the above.

33 CFR 151.25 requires the Oil Record Book to document all machinery space operations, including bilge water discharges, and cargo operations, such as loading, unloading, and internal transfers. These entries must be made on a tank-to-tank basis to provide an accurate, auditable trail of all oil movements.