Final answer:
Each sub-paragraph in a document may need to be marked according to its content, even if the main paragraph is marked unclassified. The requirement depends on the specific classification guidelines in use.
Step-by-step explanation:
The question refers to the handling of classified information and document markings. When dealing with classified documents, the answer to whether each sub-paragraph has to be individually marked if the main paragraph is marked unclassified depends on the specific classification guidelines in use. These guidelines dictate how sensitive information should be handled, and they vary by organization and the level of security required. It is not correct to assume that sub-paragraphs do not require individual markings simply because the main paragraph is unclassified; each part of a document may contain different levels of classified information and should be evaluated and marked accordingly.