What form is specifically used to cover Secret classified information outside of storage?

The correct choice is the form specifically designed for the protection and handling of Secret classified information when it is outside of storage. This form is known as SF 704, often referred to as the "Cover Sheet for Classified Documents." Its purpose is to provide a clear visual indication of the classified status of the documents it covers, helping to ensure proper handling and safeguarding measures by personnel who may come into contact with it.

When used appropriately, the SF 704 helps maintain security protocols, informing individuals that the documents are classified and should be treated according to relevant guidelines and regulations. This form is crucial for maintaining the integrity and security of sensitive information, particularly in environments where multiple individuals may access various classified materials.

Other forms in the list serve different purposes or cover other classifications, which is why they do not fit the specific requirement of covering Secret classified information outside of storage.