Which of the following actions might a PSO perform while on duty in a federal facility?

The chosen answer highlights an important responsibility of a PSO (Public Safety Officer) when on duty in a federal facility: providing first aid. PSOs are often trained to respond to medical emergencies and support the safety and well-being of individuals in their environment. This includes administering first aid to those in need, which is a crucial action to ensure the safety of all personnel and visitors within the facility.

In contrast to this, acting as an FBI agent, conducting interrogations, or identifying themselves as police officers are roles and actions that are generally outside the scope of a PSO's training and authority. PSOs do not have the same law enforcement powers as an FBI agent and would not engage in law enforcement operations, such as interrogations. Additionally, while they may have a security role, they typically do not have the designation or authority to identify themselves as police officers unless they are specifically empowered to do so within the context of their position and training. Thus, providing first aid is the most relevant and appropriate action that a PSO would perform while on duty in this context.