The fire alarm can be silenced during a fire drill conducted between the hours of

The fire alarm can be silenced during a fire drill conducted between the hours of 10 pm to 6 am because these hours are typically considered a time when the facility's occupancy may be lower, and disturbances during these hours may be more disruptive to individuals resting or sleeping. In many buildings, this time frame is established for safety and operational reasons, allowing for practice of emergency protocols without causing undue alarm to occupants during late hours.

Other options may represent times when the facility is more likely to be occupied and, consequently, should maintain the fire alarm's function to ensure people are alerted in case of an actual emergency. This distinction helps clarify the rationale behind silencing alarms during less disruptive times, thereby minimizing panic and providing a controlled environment for fire drills.