Which type of fire extinguisher is specifically intended for combating fires involving combustible metals?

Fire extinguishers are classified based on the types of fires they are designed to combat. The correct choice, Type D extinguishers, are specifically formulated for tackling fires involving combustible metals, such as magnesium, titanium, and sodium. These types of fires are distinct from other fire categories due to the unique characteristics of the metals involved, which can react explosively with water or other common extinguishing agents.

Type A extinguishers are designed for ordinary combustible materials, such as wood and paper. Type B extinguishers are meant for flammable liquids and gases, including oil and grease, while Type C extinguishers are intended for fires involving electrical equipment. Each of these classifications addresses specific materials and situations, which is why they are not suitable for extinguishing combustible metal fires. Type D extinguishers utilize dry powder substances that effectively smother metal fires without causing adverse reactions, making them the appropriate choice in these scenarios.