In the syntax of control markings, what does '/' separate?

The correct answer illustrates that the '/' in the syntax of control markings is used to separate classification categories and sub-control categories. This distinction is essential because it allows for precise and clear interpretation of how information should be handled based on its sensitivity level. Classification categories provide the overall security classification of the information, such as confidential, secret, or top secret, while sub-control categories can specify additional controls that may apply, such as limiting distribution or designating specific handling requirements.

This separation is crucial for ensuring that individuals handling classified information understand both the classification level and any additional controls that might affect how the information is managed. By clearly differentiating these categories, organizations can better enforce security protocols and protect sensitive data from unauthorized access.