"Dry Powder" fire extinguishers, which contain a mixture of graphite and sodium chloride as the extinguishing agent, are generally used to fight which type of fire?

Correct Answer: Option D — Class D

Dry powder extinguishers, specifically those using graphite or sodium chloride, are designed for Class D fires. These agents create a crust over the burning metal, excluding oxygen and absorbing heat. They are distinct from dry chemical extinguishers, which are intended for Class B and C fires.