If portion markings are used, how are portions containing CUI marked?

• A. (CUI)
• B. (CUI)U
• C. (U)
• D. (CUI)NOTE

Answer: (A)

Portion marking identifies CUI content within only part of a document. The correct approach is to place the designation (CUI) immediately before the portion that contains CUI. This signals that only that segment has controlled information and must be handled accordingly, while the surrounding text can be treated differently if it doesn’t contain CUI. The other formats aren’t standard for indicating CUI in a portion: using (U) would mark content as Unclassified, which isn’t accurate for CUI; (CUI)NOTE isn’t the recognized way to denote CUI content in a specific portion; and (CUI)U isn’t a valid marking convention. Remember, if the entire document contains CUI, you’d use a document-wide marking instead of portion markings.