Answer :

Final answer:

The physical security standards for the construction and protection of SCIFs are prescribed by the Director of Central Intelligence Directive (DCID) 6/9. Compliance with these standards ensures the confidentiality, integrity, and availability of classified information.

Explanation:

The physical security standards for the construction and protection of SCIFs (Sensitive Compartmented Information Facilities) are prescribed by the Director of Central Intelligence Directive (DCID) 6/9.

These standards outline the requirements for the design, construction, and operation of SCIFs, including measures such as access control, intrusion detection systems, and soundproofing. Compliance with these standards is crucial to ensure the confidentiality, integrity, and availability of classified information in SCIFs.