Within a CUI document, what portion marking is required for unclassified information?

Within a CUI document, what portion marking is required for unclassified information?

• A. (U)
• B. (U) information inside CUI documents
• C. (CUI)
• D. No marking

Answer: (A)

Portion markings indicate how each part of the text should be handled. In a document designated as CUI, any information that is not CUI content but appears within the same document must still be explicitly marked as unclassified with a (U) before the text. This makes clear which parts are unclassified and which are subject to CUI controls, so recipients apply the correct handling rules. Marking the entire document as CUI would hide the presence of unclassified portions, and not marking at all would leave readers unsure how to treat those segments. The (U) marking is the specific indicator used for unclassified portions within a CUI document.

Portion markings indicate how each part of the text should be handled. In a document designated as CUI, any information that is not CUI content but appears within the same document must still be explicitly marked as unclassified with a (U) before the text. This makes clear which parts are unclassified and which are subject to CUI controls, so recipients apply the correct handling rules. Marking the entire document as CUI would hide the presence of unclassified portions, and not marking at all would leave readers unsure how to treat those segments. The (U) marking is the specific indicator used for unclassified portions within a CUI document.