Final answer:
Different types of fire extinguishers are used for different classes of fire, depending on the type of fuel involved.
Step-by-step explanation:
The specific type of fire extinguisher used for each class of fire is defined by the type of fuel involved in the fire. Class K fires involve cooking oils and fats and require a specific class K fire extinguisher. Class D fires involve combustible metals and require a specific class D fire extinguisher. Class C fires involve energized electrical equipment and should be extinguished by turning off the power source. Class B fires involve flammable liquids and should be extinguished using a class B fire extinguisher.