You are planning to use the crude oil washing system on your tankship. What is required to prevent electrostatic buildup in the tanks?

Correct Answer: Option C — The source tank for the tank cleaning machines must have least one meter decanted from it.

Decanting at least one meter of oil from the source tank ensures that any water or sediment, which can contribute to electrostatic buildup during the washing process, is removed. This practice is a standard safety precaution under international and USCG guidelines to minimize the risk of static discharge within cargo tanks.