The layers of physical security defense in depth do not include . a) monitoring (video or human) b) intrusion detection/prevention c) mechanical and electronic d) environmental e) security f) clearances

clearances

Explanation:

Physical security describes security measures that are designed to deny unauthorized access. Physical security involves the use of multiple layers of interdependent systems that can include CCTV surveillance, security guards, protective inclusion of perimeter intrusion detection, deterrent systems, fire protection, and other systems and of which clearances is not part of it

i'm pretty sure questions like these aren't allowd.   but, sure.   i can and talk : ))