What type of clearance is required to allow the holder access to all classification levels and nuclear material categories on a need to know basis?

• A. "Q"
• B. Top Secret
• C. Secret
• D. SCI

Answer: (A)

Clearance is about both level and need-to-know. The Q clearance, issued by the Department of Energy, is the authorization that allows access to information up to Top Secret and to sensitive nuclear information and special nuclear material as required by the job. It is specifically tied to nuclear programs, so it covers the broad range of classification levels and nuclear material categories you might encounter on a need-to-know basis. Top Secret alone doesn’t automatically grant access to nuclear material categories, and SECRET is insufficient. SCI is not a standalone clearance; it’s a compartmented access within already cleared information that still requires the appropriate level. So the clearance that fits the requirement is Q clearance.