Which of the following documents contains DoD procedures for marking classified information?

The correct answer is DoD 5200.01, Volume 2 because this document specifically provides comprehensive procedures and guidelines for the marking of classified information within the Department of Defense. It outlines the standards for how to properly classify, mark, and declassify information, ensuring that all personnel understand the significance of marking information appropriately to protect national security.

Understanding the importance of following these marking procedures is critical for maintaining proper security classifications and safeguarding sensitive information. This volume also supports compliance with broader directives and ensures that all handling and dissemination of classified information are consistent across the DoD, which is essential for operational security and the protection of classified materials.