What is the first line of the classification authority block for originally classified information?

The first line of the classification authority block for originally classified information is "Classified By." This designation is essential as it identifies the individual or the authority responsible for the classification decision. The inclusion of this information not only establishes accountability but also provides a clear reference point for the origin of the classification, which supports the integrity of the classification process.

While "Approved By," "Authorized By," and "Confidentiality Status" may seem relevant, they do not reflect the correct terminology used in the classification authority block. "Approved By" and "Authorized By" imply a validation process but do not specifically denote the act of classifying information. "Confidentiality Status," on the other hand, does not pertain directly to the classification authority block at all. Therefore, "Classified By" distinctly fulfills the requirement for identifying the classifier and the source of the classification decision.