What is a key requirement of the practice concerning the flow of Controlled Unclassified Information (CUI)?

The requirement for Controlled Unclassified Information (CUI) emphasizes that only authorized sources and destinations should be identified for data flows involving CUI. This is crucial for maintaining security and ensuring that sensitive information is not inadvertently exposed to unauthorized individuals or entities. By enforcing this control, organizations can establish a clear perimeter around which CUI can be properly shared, monitored, and protected.

Allowing unrestricted flow of data, as suggested in some of the other options, could lead to vulnerabilities where sensitive information might be accessed or transferred by individuals or systems that do not have the proper clearance or authorization. Maintaining strict policies around the flow of CUI is essential for compliance with regulatory frameworks and for safeguarding both national security and the integrity of the information itself.