According to 46 CFR's, a fixed foam system aboard a tank vessel constructed in 1968, must be designed to supply foam for a minimum of __________.

Correct Answer: Option A — 3 minutes

Under 46 CFR 95.17-5, fixed foam systems installed on tank vessels are required to maintain a supply of foam-producing materials sufficient to operate the equipment for a minimum of 3 minutes for spaces other than cargo tanks. This duration is the regulatory standard for effective fire suppression.