When can NATO classified documents be declassified or downgraded?

The correct answer is that NATO classified documents can be declassified or downgraded only with the consent of the originating NATO organization. This requirement reflects the fundamental principles of security and control over classified information within NATO. Each NATO member country and organization retains ownership of its classified information, which includes the authority to dictate how and when that information can be disclosed or changed in its classification status.

This process ensures that sensitive information is protected and that any decisions regarding its exposure are made thoughtfully and responsibly, often involving multiple layers of oversight. Without the originating organization’s consent, there is a risk of premature disclosure, which could compromise operations, relationships, or security.

The other options reflect misunderstandings of NATO's classification protocols. It is not possible to declassify NATO documents at any time or simply after a specific period like five years; each case is treated individually based on the originating entity's policies and needs. Additionally, while a U.S. official may have authority over classified U.S. information, they do not possess unilateral power to declassify NATO documents without the proper consent from the originating NATO organization.