Is it true or false that classified material sent to NATO via mail can only be sent by express mail?

The statement is false because classified material sent to NATO does not have to be exclusively sent by express mail. While there are specific protocols and secure methods mandated for transmitting classified information, the requirement is not limited to express mail only. Various secure channels and methods are available for sending classified materials, and these may include both express and standard mail options as long as they conform to the necessary security measures and regulations. The protocols in place ensure the protection and integrity of the classified content throughout its transit, independent of the mail method utilized.

In contrast, the other options suggest limitations or specific conditions regarding the use of express mail, which do not align with the existing policies for handling classified information within NATO.