What is one way to annotate a building check sheet?

The correct choice is to annotate a building check sheet as "Personnel on Duty" (POD). This designation plays a crucial role in safety and accountability within a facility. By indicating the personnel who are present and responsible for monitoring the building during a check, it supports effective communication and provides a clear record of who was on-site in case of any incidents or emergencies. This accountability is vital for operational integrity, as well as for tracking responsibilities and actions taken during the check.

The other options do have specific meanings within operational contexts but do not serve the same purpose for annotating a building check sheet. "All Activities Proceeding" (AAP) focuses on operational status but does not directly reflect personnel accountability. "Observation Noted" (ON) might indicate that something was observed during the check, but lacks clarity regarding personnel involvement. "Unverified" (UNV) suggests that something hasn’t been confirmed, which again does not convey the necessary information about who was on duty and managing the situation during the check. Therefore, noting "Personnel on Duty" is the most effective annotation for maintaining clarity and accountability in building checks.