The person in charge of a mobile offshore drilling unit must insure that __________.

Correct Answer: Option A — the date of each fire extinguisher test is recorded

46 CFR 109.223 requires the person in charge to maintain records of fire extinguisher inspections and tests. Regular maintenance is vital to ensure that fire suppression equipment remains functional and ready for immediate use, as verified by the required annual service and documentation in the unit's official log.