What are the three fixed critical factors?

The three fixed critical factors are indeed building, occupancy, and arrangement. Understanding these factors is crucial in various emergency management and safety protocols, especially concerning fire safety.

The building refers to the physical structure itself, including its design, materials, and inherent hazards. Occupancy encompasses how the building is utilized, which directly affects the types of risks present and the number of occupants during emergencies. Arrangement involves the layout within the building, such as door placements, hallways, stairwells, and exits, which can influence both evacuation procedures and the movement of emergency responders.

By comprehensively analyzing these critical factors, responders can better assess risks and develop strategies to mitigate potential hazards, ultimately improving safety outcomes during emergencies. Other options don't encapsulate these three vital aspects as succinctly and accurately in the context of emergency response planning.