1052. Which piece (s) of equipment represented by the Fire Control Plan symbols in illustration D039SA below, can be found on the exterior of the vessel?

All three symbols (1, 53, and 55) represent equipment that may be located on the exterior of the vessel, including the fire control plan, fittings in bulkheads/decks, and devices mounted at deckheads; therefore, 'All of the above' is the correct answer.