Which of the following is NOT one of the three classification levels of information?

The classification levels of information are established to protect sensitive data and ensure that individuals with the correct clearance access the necessary information. The three primary classification levels used are Confidential, Secret, and Top Secret. Each level corresponds to the degree of potential damage that could result from unauthorized disclosure of the information.

"Confidential" is used for information that, if disclosed, could cause damage to national security. "Secret" is a higher classification for information that could cause serious damage. "Top Secret" is the most sensitive classification, where unauthorized disclosure could lead to exceptionally grave damage.

"Restricted," on the other hand, is not recognized as one of the primary classification levels in the traditional classification system, which is a reason it is the correct choice. While “Restricted” may indicate a need for limited access or control within certain organizations, it does not align with the standardized government classification levels of Confidential, Secret, and Top Secret. This distinction is important as it highlights the structured approach to handling sensitive information and the need for personnel to understand the classifications and their implications on security practices.