When securing the operation of an inert gas system, the final step should be _________.

Correct Answer: Option B — secure the salt water supply to the scrubber

Securing the salt water supply to the scrubber is the final step to prevent the backflow of cargo vapors or inert gas into the engine room or boiler uptakes. This ensures the system is fully isolated and the scrubber is drained, preventing potential corrosion or water accumulation in the ducting.