Access Control Vestibule is a security measure that separates two spaces allowing for an individual verification process, but it is not based on personal biometric attributes. Fencing is a deterrent and boundary control rather than a personal authentication mechanism. Sensors can detect and alert on various environmental factors but are not used to authenticate individual personal attributes. Biometric systems, such as fingerprint or retina scanners, are designed to authenticate individual personnel by verifying unique personal attributes, making them a key physical security control for highly secure areas.