If the fire alarm system on the 4th floor has stopped functioning, how would it be classified?

When a fire alarm system on a specific floor, such as the 4th floor, stops functioning entirely, it is classified as 'out-of-service.' This term indicates that the system is not able to perform its intended safety functions, which is crucial in maintaining the fire safety standards required in any building.

An out-of-service classification requires immediate attention and rectification, as this situation poses a potential risk to the safety of the building's occupants. Proper notification should be given to ensure compliance with safety regulations, and appropriate measures should be taken to address the malfunction.

In contrast, the other terms do not accurately reflect the status of the fire alarm system. 'Under maintenance' would imply that there are repairs being conducted on the system, while 'temporarily inactive' doesn't convey the severity of the situation as it may suggest that the system can be easily reactivated. 'Fully operational' clearly does not apply here since the system has ceased to function. Hence, labeling the system as 'out-of-service' correctly identifies the need for urgent action to restore its operability.