The concept used to determine the derivative classification of the new document is CONTAINED IN.
Explanation: In derivative classification, which is the process of using existing classified information (incorporating, paraphrasing, restating, or generating) to create new material and marking the new material consistent with the classification markings that apply to the source information, contained in is a concept that that refers to the process of extracting classified information as it is stated in without the need for additional interpretation or analysis, and incorporating this information into a new document.