What class of fire is very dangerous and security officer should not fight?

Class B fires, which involve flammable liquids such as gasoline, oil, and solvents, are very dangerous and should not be fought by security officers without proper training and equipment. Attempting to extinguish these fires with water can exacerbate the situation, as water can spread the flames. Security officers should prioritize evacuation and alerting emergency services rather than trying to fight these fires themselves. It's crucial to leave such situations to trained professionals.