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

Correct Answer: Option D — All of the above.

MARPOL Annex I and 33 CFR 151 require tankers to record all oil cargo transfers, internal movements, and machinery space bilge discharges on a tank-to-tank and operation-specific basis within the official Oil Record Book to verify environmental compliance.