What classification level should a document be protected at if it is stored in a container?

A document stored in a container must be protected at the same classification level as the highest classified material contained within that container. This ensures that sensitive information does not become inadvertently accessible to individuals who do not have the appropriate clearance. By maintaining the highest classification level for the entire container, security protocols safeguard all materials stored within, even if some individual documents may have a lower classification. This practice is essential for the integrity of classification systems and helps prevent unauthorized disclosure of sensitive information.

While other choices might imply varying degrees of protection, they do not adequately address the need for standardized security measures based on the highest classification present, which is paramount in maintaining national security and complying with legal requirements.