Fire main outlet valves or hydrants located on exposed decks shall be __________.

Correct Answer: Option B — protected against freezing or be fitted with cutout valves and drain valves

Exposed fire main hydrants are susceptible to freezing in cold climates, which would render the fire main inoperable. 46 CFR requires these outlets to be protected against freezing, typically through the use of cutout valves and drain valves, ensuring the system remains pressurized and ready for immediate use at all times.