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

The Security Classification Guide (SCG) is an authorized source for derivative classification because it provides official, specific instructions regarding how to classify information or materials based on their content and the classification levels that apply. The SCG outlines the factors that should be considered when classifying information, ensuring that any derivative classification aligns with established protocols and guidelines.

Using the SCG helps to maintain consistency and supports compliance with security requirements, thereby reducing the risk of unauthorized disclosure. It serves as a reference that derivative classifiers can rely upon to ensure that they are appropriately applying classification markings to documents derived from classified sources. Consequently, it is crucial in providing the necessary authority for derivative classification actions.