What task typically requires the PSO to interact closely with visitors?

The task that typically requires the PSO to interact closely with visitors is related to visitor processing. This function involves direct engagement with individuals who are entering the facility, ensuring that security protocols are followed and that visitors are properly checked in according to established procedures.

In visitor processing, the PSO is responsible for verifying identification, explaining the facility's rules and regulations to visitors, and ensuring that they are guided safely throughout their visit. This interaction is critical to maintaining security and providing assistance to visitors, enhancing their overall experience while ensuring compliance with safety measures.

The other tasks mentioned, such as conducting training sessions, monitoring surveillance feeds, and performing maintenance checks, involve less direct interaction with visitors. These activities are more focused on internal operations or security monitoring, which does not require the same level of public engagement and communication that visitor processing demands. Thus, the emphasis on interpersonal skills and public interaction makes visitor processing the correct answer in this context.