A security manager is reviewing security best practices. Which of the following would NOT be a physical security best practice?

Hardening refers to the process of securing a system by reducing its surface of vulnerability, typically through configuration changes, patch management, and other technical measures. While it's an essential aspect of cybersecurity, especially within software and network environments, it does not directly pertain to physical security. In contrast, practices such as maintaining proper lighting, installing cameras, and monitoring access logs are all crucial elements in a physical security strategy aimed at protecting facilities and personnel from unauthorized access and potential threats.

Thus, hardening stands out as a practice that focuses more on cybersecurity rather than the physical aspects of security, making it not applicable in the context of physical security best practices.