In which scenario can a fire extinguisher be serviced 30 days before its due date?

The correct choice indicates that a fire extinguisher can be serviced 30 days before its due date with written approval from the owner. This is important because it allows for flexibility in the maintenance schedule while ensuring that the owner is informed and in agreement with the service timeline. Having written approval helps maintain accountability and proper record-keeping, which is crucial for safety compliance and auditing purposes.

In other scenarios, approval may not be sought or necessary, which could leave room for misunderstandings or mishandling of the service process. The option mentioning closure of the facility suggests that servicing is strictly tied to operational status, which does not provide the same level of oversight and control by the owner. While conducting service during annual inventory could be an effective time for many maintenance tasks, it does not inherently relate to being able to service before the due date without the owner's consent.