What level of classification should items be classified at?

Items should be classified at the level of any included classified information to ensure compliance with established classification guidelines and to protect sensitive information effectively. This approach aligns with the principle of "derivative classification," where the classification level of a new item is determined by the highest classification level of the information on which it is based.

By classifying at this level, organizations can prevent unauthorized disclosure of sensitive information while allowing for proper sharing and handling based on the existing classification frameworks. It ensures that all aspects of the included information are adequately safeguarded, maintaining national security and compliance with regulations.

The other options may not provide sufficient protection for sensitive information. For instance, classifying at the lowest level could risk exposure of more sensitive data, while determining classification based on agency preference could lead to inconsistencies and potential vulnerabilities. Choosing the highest public rating does not ensure adequate security measures for classified materials. Thus, aligning classification with the level of contained classified information is the most responsible and secure practice.