The correct answer is Both the above. Explanation & Key Takeaways: • Carbon dioxide and CB(Bromochlorodifluoromethane), CB(chlorobromomethane) and CB (Chlorobromomethane and Carbon tetrachloride) can be used as a fire extinguisher. Related Concepts: • A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. • It is not intended for use on an out-of-control fire, such as one which has reached the ceiling, endangers the user (i.e., no escape route, smoke, explosion hazard, etc.), or otherwise requires the expertise of a fire brigade. • Typically, a fire extinguisher consists of a hand-held cylindrical pressure vessel containing an agent that can be discharged to extinguish a fire. • Fire extinguishers manufactured with non-cylindrical pressure vessels also exist but are less common.