Which classification level is the lowest commonly used for information whose unauthorized disclosure could damage national security?

• A. Confidential
• B. Secret
• C. Top Secret
• D. Restricted

Answer: (A)

The concept here is assigning a sensitivity level to information based on how damaging its unauthorized disclosure could be to national security. Among the standard levels, the lowest that still triggers protection for national-security information is Confidential. This level signals that if the information were released without authorization, it could cause damage, but not to the extent that would require Secret or Top Secret protection. It allows broader, but still restricted, access to those with the proper need-to-know and clearance, balancing usability with security. Higher levels are reserved for information whose disclosure would cause progressively greater harm, which is why they sit above Confidential.

In some contexts you might see terms like Restricted used, but it’s not part of the formal three-tier scale for national security classifications in most systems. The formal lowest level used for information that could damage national security is Confidential.