Which of the following is NOT a classification level defined by Executive Order 13526?

The classification levels defined by Executive Order 13526 include three specific categories: Confidential, Secret, and Top Secret. Each of these categories indicates different levels of sensitivity regarding national security information and entails varying degrees of access and protection requirements.

Confidential information is the lowest level of classification and requires protection from unauthorized disclosure, while Secret information poses a greater risk to national security if disclosed, and Top Secret represents the highest level, where unauthorized disclosure could cause exceptionally grave damage to national security.

The option that is not a classification level recognized by this Executive Order is "Limited." This term does not appear in the classification structure established by the order, and therefore does not have any of the formal protections or requirements associated with the defined classification levels. Understanding these distinctions is crucial for properly marking and handling classified information in accordance with federal guidelines.