Which space(s) is(are) deducted from gross tonnage to derive net tonnage?

Correct Answer: Option D — All of the above

Deductions from gross tonnage to derive net tonnage, per 46 CFR 69.61, include spaces dedicated to the crew, such as mess rooms, cabins, and sanitary facilities, as well as navigation spaces like the chart room and storage areas like boatswain's stores, as these do not generate direct revenue for the vessel.