On a MODU, a cabinet or space containing the controls or valves for the fixed firefighting system must be __________.

Correct Answer: Option D — posted with instructions on the operation of the system

Title 46 CFR requires that any cabinet, enclosure, or space housing controls or actuating valves for a fixed firefighting system must have clear, concise operating instructions permanently posted on or near the door to ensure proper deployment during high-stress emergency conditions.