Which operation is conducted from the exterior of a building?

The correct response is based on the understanding of firefighting tactics and operations in relation to fire behavior, structural integrity, and overall safety. A defensive operation is taken from the exterior of a building with the primary aim of containing a fire and protecting nearby structures, rather than engaging it directly within the fire environment. This approach is employed when conditions are too hazardous for interior operations or when the fire is too extensive to control from within.

By using a defensive strategy, firefighters can manage and mitigate the situation while preserving their safety and minimizing property damage. This could involve using hoses and aerial devices to apply water from the outside or establishing a perimeter to ensure that the fire does not spread further.

In contrast, offensive operations are more aggressive actions aimed at putting out the fire from the inside, while indirect operations may involve tactics that utilize smoke and heat management, typically from within the structure. Support operations usually focus on auxiliary services or logistical support for the firefighting efforts, rather than direct engagement with the fire. Thus, the definition of a defensive operation aligns perfectly with the requirement for an exterior tactic.