What is the BEST design for securing physical perimeter protection?

Crime Prevention through Environmental Design (CPTED) is the best overall design strategy because it encompasses a broad set of principles-natural surveillance, natural access control, territorial reinforcement, and environmental maintenance-that guide how physical spaces are designed and managed to deter threats. Unlike individual countermeasures, CPTED integrates multiple layers of physical security (including barriers, lighting, landscaping, and visibility) into a unified framework. This makes it the most holistic and proactive answer for 'best design' of physical perimeter protection.

Barriers, fences, gates, and walls are individual physical countermeasures and represent only one tactical layer of perimeter security, not a comprehensive design methodology.

Business Continuity Planning (BCP) addresses organizational resilience and recovery from disruptions, not the physical design or hardening of a perimeter against intrusion.

Closed-circuit television (CCTV) is a detective control used for monitoring and evidence collection, but it does not proactively prevent or deter physical perimeter breaches by itself.