Which of the following is NOT a step in derivative classification?

The process of derivative classification involves specific steps aimed at ensuring that information is classified properly based on existing classified materials. Reviewing source documents is a fundamental step, as it allows an individual to assess the classification level and context of the original information. Classifying information by compilation is also essential, as derivative classifiers combine and restate existing classified data into a new document while maintaining appropriate security classifications. Marking information appropriately ensures that all classified materials are clearly identified and handled according to established protocols.

In contrast, submitting a formal challenge to classified information does not fall within the steps of derivative classification. It is a separate action that typically involves questioning or disputing the classification of existing information rather than actively engaging in the classification process itself. This distinction is crucial, as derivative classification is about using existing classified materials to produce new documents while challenges to classification relate to the validity of existing classifications.