What are the three types of fire extinguishers mentioned?

The selection of ABC (chem), Water, and CO2 as the three types of fire extinguishers is correct because these categories represent common fire extinguishing agents utilized for different classes of fires.

ABC extinguishers are versatile and effective against Class A (ordinary combustibles like wood and paper), Class B (flammable liquids such as gasoline and oils), and Class C (electrical fires). This type of extinguisher uses a dry chemical agent that smothers the fire and prevents re-ignition.

Water extinguishers are primarily used for Class A fires, as they cool the burning material and can extinguish the flames effectively. However, they should never be used on Class B or Class C fires due to the risk of spreading the fire or causing electric shock.

CO2 extinguishers are suitable for Class B and C fires, as they displace oxygen and help to suffocate the fire while also being non-conductive, making them safe for use near electrical equipment.

Together, these extinguishers cover a wide range of fire scenarios commonly encountered, making this combination logical and practical for fire safety training and response.