Which statement about the pressure in a tank being inerted by an inert gas system is TRUE?

Correct Answer: Option A — A positive pressure should be maintained at all times.

Maintaining a positive pressure is critical to prevent the ingress of atmospheric air into the cargo tank. If the pressure drops below atmospheric, oxygen-rich air could enter, creating a flammable mixture. 46 CFR requires that inert gas systems maintain a positive pressure to ensure the tank atmosphere remains non-combustible.