Which of the following is NOT a layer of protection through physical security planning?

The choice of Human Resources Management as not being a layer of protection in physical security planning is accurate because it primarily deals with the management of personnel, staffing, and organizational policies rather than direct physical security measures. Physical security planning involves various tangible elements designed to deter, delay, or respond to physical threats against assets or individuals, such as physical barriers, interior controls, and the design of a building's exterior.

Perimeter barriers are essential in creating the first line of defense against unauthorized access and protecting against potential intrusions. Interior controls are focused on securing areas within a facility, including access controls and surveillance systems to monitor activities inside. The building's exterior encompasses design elements that enhance security, such as fences, lighting, and landscaping that can deter potential threats. Together, these factors form a comprehensive physical security strategy, while human resources management, though important for overall security culture and employee conduct, does not directly contribute to the physical layout or infrastructure designed to protect against physical security breaches.