What action should be taken if an unauthorized entry is detected?

When an unauthorized entry is detected, the primary action to take is to notify security immediately. This is crucial because unauthorized entries can pose serious security risks, including potential threats to the safety of individuals or property. By alerting security, trained professionals can respond promptly to assess the situation, investigate the matter, and take necessary actions to ensure safety.

Additionally, security personnel have specific protocols and resources to handle such situations, which individuals may not possess. This step is prioritized over other options because it directly involves action from trained experts who can manage the incident effectively and securely. Other choices may not provide the same level of immediate response or safety assurance and could potentially exacerbate the situation.