the correct banner for unclassified documents with cui is

The correct banner marking for unclassified documents that contain Controlled Unclassified Information (CUI) is: CUI.

In other words, when an otherwise unclassified document includes CUI, the banner line at the top and bottom of each page must, at a minimum, display “CUI” in bold, capitalized text to show that special handling and safeguarding are required, even though the information is not classified.

Some training and quiz sites sometimes show options like “UNCLASSIFIED//CUI,” but current DoD CUI marking guidance and CUI marking handbooks specify that the required control marking on an unclassified document containing CUI is the banner line “CUI” (with any additional required designation details provided in the separate CUI designation indicator block, not in the banner itself).

So, if you see a multiple‑choice question asking: “The correct banner marking for UNCLASSIFIED documents with CUI is:”, the best answer is “CUI”.