Which action should be taken if a security guard detects unauthorized access?

When a security guard detects unauthorized access, notifying the appropriate authorities immediately is crucial for several reasons. This response ensures that the situation is handled by professionals trained to deal with security breaches, which can prevent further unauthorized actions and potential harm. It also helps to document the incident accurately from the outset, which is vital for any potential investigations or legal actions that may follow.

By alerting the authorities, the security guard can also avoid personal risk that could arise from confronting an unauthorized individual alone or failing to take action altogether. Quick notification enhances the overall security response protocol and may deter further criminal activity by ensuring that trained personnel can respond promptly.

The other choices may lead to increased risk or inadequate responses to the situation, making immediate notification the best course of action.