What item is permitted to be stored alongside classified information?

In the context of storing classified information, the most stringent regulations apply to what can be stored alongside it. Classified information is sensitive and requires specific handling to ensure its security and integrity. When dealing with such materials, it is imperative to avoid any potential risk or compromise.

Storing nothing alongside classified information helps to eliminate the risk of mixing different classification levels, which could inadvertently lead to unauthorized disclosures or loss of control over sensitive documents. It restricts access to only the classified materials themselves, ensuring that they remain isolated and secure. This approach aligns with best practices in information security, where minimizing interactions between classified and unclassified items is crucial for protecting national security or sensitive information.

Thus, the appropriate choice indicates that nothing should be stored alongside classified information to maintain the highest security standards.