In pump rooms and pipe tunnels, flameproof electric light fittings are generally fitted this means that

A. The fitting is completely gas-tight and nongas can enter into contact with the bulb and electric connections
B. Gas may enter but even if an explosion takes place the fitting is so strong that the explosion will be con…….
C. The electrical supply will disconnect automatically in case of fire
D. Even if fire occurs ,it will not consume the fitting