Which NEC assists in performing security-related administrative control over classified materials?

The correct choice, the NEC 791A, refers to the rating associated with personnel responsible for managing and administrating security over classified materials. This NEC provides specialized training focused on administrative control measures that ensure the protection, handling, and accountability of classified data in accordance with established security protocols. Having this NEC indicates that the individual is equipped with the necessary knowledge and skills to implement and oversee security policies related to classified information effectively.

In contrast, the other NECs listed do not focus specifically on security administration for classified materials. They may pertain to different areas of expertise and responsibilities that do not involve the oversight of classified information or administrative controls, making them less relevant in this context.