The correct answer is B because, in a consent-based forensic examination, the role of the witness is to confirm that the consent was knowingly and voluntarily given by the person authorizing the search. Under the CHFI v11 blueprint, investigators are expected to understand seeking consent, obtaining witness signatures, search and seizure procedures, and best practices for handling digital evidence. A witness is not primarily present to decide legal authority, and the witness does not create seizure powers for the examiner. Instead, the witness helps support the validity of the consent process by confirming that the agreement was actually signed and that it was not coerced or improperly obtained. This can become especially important later if the defense challenges whether the examination was authorized. Option A refers to deciding procedural requirements, which is not the witness's core function. Option C may happen in some cases, but it is not the main reason the witness is present at the time of signing. CHFI emphasizes defensibility and proper evidence-handling foundations, so validating voluntary consent is the best answer.