PSOs perform their tasks according to duties outlined in what?

The correct answer is "Post orders," which are essential documents that outline the specific responsibilities and expectations for personnel assigned to particular posts. These orders provide detailed instructions regarding daily duties, protocols, and procedures that must be adhered to during shifts. By following the post orders, Security Officers (PSOs) ensure consistency in operations and that all tasks are performed in alignment with organizational standards and policies.

The other options, while potentially important in a broader context, do not stipulate the comprehensive and structured guidelines outlined for PSUs. For instance, "Form 1103" may refer to a specific administrative document that may not be relevant to daily operational duties. "Their supervisor's verbal instructions" can be subjective and vary from one supervisor to another, lacking the formal structure and accountability of written post orders. Similarly, "Contract guidelines" pertain more to the overarching terms of employment and the service agreement rather than the day-to-day responsibilities specific to a PSO’s role at a given post. Thus, post orders serve as the primary source of duty and operational direction for PSOs.