Security standards typically require that any opening in a perimeter (e.g., HVAC ducts, pipe chases, vents) be lockable or otherwise protected if the cross-sectional area is 96 square inches or greater. This threshold is based on a size that could permit unauthorized entry or object passage.
A, B, and D are incorrect measurements based on security industry benchmarks.
[References:, PSP Study Guide – Perimeter Protection Standards, POA Manual – Barrier Design and Access Point Control]
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