Which markings appear on all derivatively classified documents?

The appearance of portion markings, along with the classifications indicating who classified the document and from which source the information is derived, is a fundamental requirement for all derivatively classified documents. This practice is essential because it enhances understanding and compliance with classification guidelines, ensuring that even portions of the document can be classified or declassified independently.

Portion markings indicate specific sections of the document that contain classified information, allowing users to identify sensitive material easily. The "classified by" marking shows who was responsible for the classification, while the "derived from" marking specifies the source of the classified information. This systematic approach maintains the integrity of classified information and aids in safeguarding national security interests by clearly delineating how the information is constructed and under what authority it is protected.

In contrast, while other options may contain relevant concepts, they do not encompass the essential required markings for all derivatively classified documents, which must include these specific indicators regarding classification and derivation.