When deriving classification from existing classified information, what should be consulted for specific classification information?

The best choice in this scenario is the security classification guide. This document provides explicit guidance on how to classify information derived from existing classified materials, including specific criteria for classification levels and handling instructions. By consulting the security classification guide, an individual can ensure that any derivative information is classified consistently and correctly in accordance with established policies and procedures.

In derivative classification, it is crucial to adhere to the instructions and parameters set forth in these guides, as they offer detailed directions on what information can be classified, how to mark it, and any potential exemptions. This helps maintain the integrity and security of the information while ensuring compliance with relevant regulations.