On small passenger vessels electrical equipment in spaces that contain gasoline powered machinery must be __________.

Correct Answer: Option D — All of the above

46 CFR 183.340 requires that electrical equipment in spaces containing gasoline-powered machinery be ignition-protected, intrinsically safe, or explosion-proof. These measures prevent electrical sparks from igniting volatile fuel vapors, which is critical for fire and explosion prevention in confined machinery spaces where gasoline is present or handled.