Which action is crucial when creating new classified documents?

Marking classified documents accurately and consistently according to established standards is crucial because it ensures that all personnel who access the information understand its classification level and handling requirements. Proper marking helps prevent unauthorized disclosure and maintains the integrity of national security. Classification markings alert individuals to the sensitivity of the information and facilitate appropriate protection measures, whether in storage, during transport, or while in use. This practice is outlined in various guidelines and regulations that govern the handling of classified materials, reinforcing the importance of clarity and adherence to standards in safeguarding sensitive information.