Final answer:
The concept used to determine the derivative classification in the new document is the Security Classification Guide.
Step-by-step explanation:
The concept used to determine the derivative classification in the new document for the student's question is the Security Classification Guide. The Security Classification Guide provides a set of criteria and guidelines for assigning classification levels to documents based on their sensitivity and potential impact on national security. It helps to ensure that classified information is properly protected and disseminated only to authorized individuals or groups.