Which of the following is a method for securely handling classified material?

The method for securely handling classified material involves ensuring that it is protected and stored in a way that prevents unauthorized access. Locking up classified material and informing a supervisor is the appropriate action to take in order to maintain its security and integrity. This involves placing the material in a secure location, such as a locked file cabinet or safe, which is designed to prevent access by individuals who do not have the necessary clearance.

Informing a supervisor adds an additional layer of accountability and ensures that the proper protocols are followed, enabling appropriate measures to be taken in case of security concerns or breaches. This approach aligns with established security protocols that govern the handling of classified information to safeguard national security interests.

Other approaches, such as disposing of classified material or keeping it in public places or on one’s person without encryption, present significant risks and are not in compliance with proper security practices for classified information.