What must be marked on new material created through derivative classification?

The answer is that new material created through derivative classification must be marked with the same classification markings as the original source. This requirement ensures that the integrity of the original classification is maintained and that the new material's sensitivity is accurately conveyed based on the classification of the source documents.

When derivative classification is performed, the individual creating the new material is acknowledging that the information derives from previously classified sources. Therefore, it must appropriately reflect the classification level of those sources to prevent unauthorized disclosure and maintain consistent protection of potentially sensitive information. This marking is critical for ensuring that anyone who accesses the new document understands its classification status and handles it according to the established protocols associated with that classification.

The other options do not align with the principles of derivative classification. For instance, marking no classifications would lead to significant risks of unauthorized exposure of classified information, while only marking the classification date or including the classifier's name and title does not provide the necessary context regarding the sensitivity of the material created.