Final answer:
The appropriate action is to verify the technician's authorization for entering the restricted area by contacting the individual who allegedly gave permission, and if the story cannot be confirmed, to then contact the police.
Step-by-step explanation:
When confronted with a scenario where an individual claiming to be a technician enters a restricted area without proper authorization, it's critical to address the situation with caution. The correct course of action would be to Ask who authorized him to enter the site and contact them to confirm the story. If the person's story cannot be confirmed, the next step would be to contact the police to handle the situation, as there could be a potential security breach. It is not within the security personnel's jurisdiction to arrest someone, so telling the man he is under arrest would not be correct. Similarly, issuing a pass without verification could compromise security, and simply making a note without taking further action may not address a potential threat.