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The classification levels of information, specifically within the context of national security, are organized into three primary categories: Confidential, Secret, and Top Secret. Each of these levels corresponds to the degree of harm that unauthorized disclosure could cause to national security.

Confidential information, for example, would cause damage if disclosed, while Secret information would cause serious damage, and Top Secret information could cause exceptionally grave damage if it were leaked. These tiers help to establish a framework for handling sensitive information and ensure that proper measures are in place to protect it according to its level of sensitivity.

In contrast, Public information is not classified and holds no restrictions in terms of who can access it. This category represents information that is available to the general public and does not require special protection. Therefore, identifying Public as not being a primary category of classified information is accurate, as it falls outside the classification system designed to protect sensitive national security-related information.