Which of the following is an authorized method for derivative classification?

Following established classification guides is an authorized method for derivative classification because these guides provide consistent and standardized criteria for determining how information should be classified based on its content, context, and potential impact on national security. Utilizing these guides helps ensure that derivative classifiers adhere to established policies and procedures, which is essential for maintaining the integrity and security of classified information.

Established classification guides are developed by experts and are periodically updated to reflect changes in laws, policies, or the security landscape. By relying on these guides, derivative classifiers can appropriately identify and mark classified information, reducing the risk of errors that could lead to unauthorized disclosure.

Utilizing personal discretion or relying solely on results from previous classifications can lead to inconsistencies and potential misclassification, as these methods may not align with current classification standards. Classifying by consensus may also lead to subjective decision-making, which is not a recommended practice in the classification process.