How many fire extinguisher types are mentioned in the provided information?

The correct answer states that four types of fire extinguishers are mentioned. Fire extinguishers are categorized based on the type of fire they are intended to combat, and understanding these types is essential for safety and effective fire response strategies.

Typically, the classifications include:

1. Class A - Used for ordinary combustibles like wood, paper, and cloth.

2. Class B - Designed for flammable liquids such as grease, gasoline, and oil.
3. Class C - Applicable for electrical fires.
4. Class D - Specifically for combustible metals.

Each type is equipped with different agents that respond uniquely to various fire scenarios, showcasing the importance of knowing which fire extinguisher to use in particular situations. Mastery of this knowledge promotes safety and helps in effective emergency response.