What must be included on a classified document's markings?

The correct answer involves several critical elements that must be present on a classified document's markings to ensure proper handling and security. Specifically, classified documents are required to have the classification level, which indicates the sensitivity of the information contained within. Additionally, the identity of the classification authority must be included; this is the individual or office that has the authority to classify the information, providing accountability and traceability. Lastly, the date of declassification is essential as it informs readers of when the classified status will expire or be reassessed, ensuring that the information is not held under an unnecessary classification indefinitely.

These components work together to maintain the integrity of the classified material and ensure that those who handle it are aware of the proper protocols. Including all these elements helps prevent unauthorized access and ensures compliance with government regulations regarding classified information.