Which of the following is NOT a characteristic of a Class D fire?

A Class D fire involves flammable metals such as magnesium, titanium, and sodium, which have unique combustion characteristics. These fires cannot be extinguished using water because water may react vigorously with the burning metals, potentially causing an explosion or spreading the fire further. Instead, Class D fires are specifically extinguished using dry powder agents formulated for that purpose, which can suppress the flames effectively without reacting adversely with the burning metals.

Therefore, stating that a Class D fire requires water for extinguishment is incorrect; in fact, using water on these types of fires can be extremely dangerous. The correct approach to manage a Class D fire involves using designated dry powder extinguishing agents that are designed to handle the specific reactions associated with combustible metals.