To whom does the SAO recommend waivers of physical security safeguards?

The correct answer is B, the Director, CA SAPCO. The Special Access Program Central Office (CA SAPCO) oversees special access program activities, ensuring compliance with security directives and safeguarding classified information. When it comes to physical security safeguards, the recommendation for waivers typically flows through this office, as they are responsible for evaluating the need for such waivers and determining whether they are justified based on the specific circumstances of the program.

In contrast, the roles of the Chief Engineer, Site Security Manager, and Project Manager, while significant, do not carry the same level of authority or responsibility concerning the approval and oversight of security waivers. The Chief Engineer primarily focuses on technical aspects and engineering integrity, the Site Security Manager oversees the implementation of security procedures and may identify the need for waivers, but does not have the authority to recommend them, and the Project Manager is primarily concerned with project execution and may communicate security needs but does not handle waiver recommendations directly to CA SAPCO. Therefore, the Director of CA SAPCO is the appropriate authority to make such recommendations regarding physical security safeguards.