What constitutes a "breach of security"?

A "breach of security" refers to any incident where security measures are compromised, potentially allowing unauthorized access or exposure to risks within a secured area. An unauthorized entry into a secured area exemplifies this definition perfectly, as it indicates that someone not granted permission has bypassed the security protocols in place, thereby creating a vulnerability.

In contrast, options such as a normal inspection of premises or a scheduled visit by authorized personnel indicate activities that are in line with security protocols, highlighting compliance rather than a breach. An emergency evacuation, while a critical response to a potential threat, is also a part of established safety procedures and does not constitute a breach. Therefore, the identification of unauthorized entry as a breach underscores the importance of maintaining security and monitoring access to restricted areas.