What To be classified or maintained as classified information must meet all of the following criteria?

To be classified as classified information, it must meet the criteria of being related to national security, where unauthorized disclosure could cause harm to the United States or its interests. It must be officially designated as classified by an authorized individual or agency. Additionally, it must be marked appropriately to indicate its classification level, such as confidential, secret, or top secret. Finally, the information must be created or received in the context of a government function or activity.