In which situation is a deviation from a Standard Operating Procedure (SOP) considered acceptable?

A deviation from a Standard Operating Procedure (SOP) is considered acceptable in extenuating circumstances where safety is ensured because it acknowledges that there may be situations beyond normal operational conditions that require immediate action or flexibility. This flexibility is necessary to prioritize the safety of employees and passengers. In such scenarios, following the SOP could potentially lead to unsafe situations, so an informed judgment may be made to deviate in a manner that still upholds safety standards.

The other options suggest reasons that do not prioritize safety or do not align with the principles of SOP adherence. Convenience for employees does not justify a deviation, as it could compromise operational integrity and safety standards. The absence of authorized personnel doesn't inherently warrant a deviation; established protocols are typically in place to guide staff regardless of specific personnel availability. Lastly, staffing levels may affect operations, but they should not be used as a rationale for bypassing safety protocols or operating procedures, which are designed to ensure consistent and safe service.