Final answer:
A policy keeping exit doors unlocked during a fire is a fail-open policy, prioritizing safety and allowing free egress in emergencies. Option A is correct.
Step-by-step explanation:
A policy in which all exit doors for a building stay unlocked during a fire is an example of a fail-open policy. A fail-open policy is designed to ensure that in the event of a system failure, such as a fire alarm or electrical outage, security systems like doors will default to a state that prioritizes safety and allows free egress.
This is in contrast to a fail-close policy, which would lock down doors in the case of a failure to secure an area, potentially trapping people inside during emergencies like a fire.
The correct answer is a. fail-open.
Fail-open is a policy that allows for the doors to remain unlocked during a fire, ensuring that people can exit the building easily. This policy prioritizes the safety and quick evacuation of individuals in an emergency situation.
An example of this policy is the use of panic bars on exit doors, which allow people to push the door open with minimal force, even if it is locked. This ensures that the doors will fail-open and provide a safe exit during a fire.