What is the primary source for derivative classification?

The primary source for derivative classification is the Security Classification Guide (SCG). SCGs provide essential guidance on what information must be classified and at what level, allowing individuals to correctly derive classifications based on existing, classified information. They offer detailed instructions and criteria that help ensure consistent application of classification standards across different areas and agencies, which is critical for maintaining national security.

While other options, such as the National Security Directive and Executive Order on Classification, provide overarching policy and framework for classification systems, they do not serve as direct references for derivative classifiers. The Federal Bureau of Investigation Guidelines can outline security procedures specific to the FBI, but they do not function as a comprehensive source for derivative classification more broadly. Thus, the SCG is essential for anyone involved in classifying information to ensure that they adhere to established protocols while handling classified data.