What type of information is NOT contained in the classification authority block for a document?

The classification authority block in a classified document serves as a crucial reference point for understanding the specifics regarding the classification of that document. Each piece of information within this block is essential for maintaining the integrity and security of classified information.

Classified By information indicates who authorized the classification of the document, providing accountability and traceability for the classification decision. Derived From information specifies the source of the classified information, which can be critical for determining the classification level of the document. Declassify On information outlines the specific date or event that, upon occurrence, will result in the declassification of the information, ensuring that sensitive information does not remain classified longer than necessary.

Given this context, the correct assertion is that all of the mentioned types of information are indeed contained within the classification authority block, confirming that the option indicating that none of these types of information is absent from the block is accurate. Therefore, the emphasis on the necessity of each component strengthens the understanding of how classification contributes to information security.