Which statement best contrasts defend-in-place and evacuation strategies?

• A. Defend-in-place means immediate evacuation to the street level.
• B. Defend-in-place involves sheltering occupants in protected spaces; evacuate involves leaving via designated routes.
• C. Evacuation is only used for small rooms, not entire buildings.
• D. Defend-in-place means turning off all life safety systems.

Answer: (B)

Defend-in-place focuses on keeping occupants safe where they are by sheltering them in protected spaces that are designed to resist fire and smoke, with doors closed and systems in place to maintain tenable conditions until the danger passes or rescue arrives. Evacuation means moving people out of the building through designated exits and routes to a safe location outside, whenever conditions allow a safe and orderly egress.

The statement that best contrasts the two is the one that describes defend-in-place as sheltering occupants in protected spaces and evacuation as leaving via designated routes. This captures the fundamental difference: defend-in-place relies on staying put in a safeguarded area, while evacuation relies on exiting through prepared paths.

Other options aren’t as accurate: evacuation is not automatically immediate or universal for all buildings and rooms, and defend-in-place does not mean turning off life safety systems.