Which strategy in physical security utilizes automated systems to monitor environments?

The strategy that utilizes automated systems to monitor environments is electronic surveillance. This approach employs various technologies such as cameras, motion detectors, and alarm systems to oversee and record activities within a particular area. With electronic surveillance, security personnel can receive real-time alerts and have the capability to review recorded footage, which enhances the overall security posture by allowing for immediate response to incidents or threats.

In contrast, access control primarily focuses on restricting who can enter or exit specific areas, often through physical means such as locks, cards, or biometric systems. Physical barriers are tangible structures like fences or walls designed to deter unauthorized access. Environmental design involves strategically planning the physical layout and features of a space to enhance security, such as improving visibility and maintaining proper lighting, but it does not typically include automated monitoring systems.