Final answer:
When an out of service fire protection system is restored to normal operations, all entities should be notified except the insurance company.
Step-by-step explanation:
When an out of service fire protection system is restored to normal operations, all of the following entities should be notified EXCEPT the insurance company.
The fire department should be notified to ensure that they are aware of the system's restoration and can update their records. Building occupants should be informed so that they are aware that the fire protection system is functioning again.
Maintenance staff should also be notified to ensure they are aware of the system change and can continue with regular maintenance tasks.