Which of the following is NOT a type of classified information?

The correct answer is "Public" because classified information is defined by its restricted access based on the sensitivity of the information and is categorized into specific classifications: Confidential, Secret, and Top Secret.

Confidential information requires protection because its unauthorized disclosure could reasonably be expected to cause damage to national security. Secret information demands a higher level of protection, as its unauthorized disclosure could cause serious damage, and Top Secret signifies the highest level of sensitivity, where unauthorized disclosure could cause exceptionally grave damage to national security.

In contrast, public information is not classified and can be freely accessed by anyone without any restrictions. This distinction is crucial for understanding the security framework within the National Industrial Security Program (NISP), where handling classified information requires adherence to specific protocols aimed at safeguarding national interests.