Which statement regarding "Revealed by" classification is accurate?

The statement regarding "Revealed by" classification is accurate when it refers to situations where information is extracted either word-for-word or paraphrased. This classification process deals with information that may not necessarily be newly created but involves the interpretation or relay of existing classified information. When information is taken directly or modified from a classified source, it retains its classification status, thereby necessitating derivative classification practices to ensure proper handling and protection.

Option A is less accurate because "Revealed by" classification applies not just to documents that are classified but to any information drawn from classified sources. Option B focuses on oral communication, which is not the primary context for "Revealed by" classification, since it encompasses both written and verbal forms of information. Lastly, option D incorrectly limits the context to unclassified information, contradicting the very nature of "Revealed by" classification, which is grounded in the handling of classified information.