On a tanker vessel, what is the required combined capacity of the inert gas generating system as compared to the total capacity of all the cargo pumps which can be operated simultaneously?

Correct Answer: Option D — 125%

46 CFR and SOLAS regulations require the inert gas system to have a capacity of at least 125% of the maximum rated discharge capacity of all cargo pumps. This safety margin ensures that the system can maintain a positive pressure in the tanks during the fastest possible discharge rate.