BOTH INTERNATIONAL & INLAND A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights meet which requirement(s)?

Correct Answer: Option A — do not impair the visibility or distinctive character of the prescribed lights

Rule 20(b) allows for additional lights or shapes, provided they do not impair the visibility or distinctive character of the lights prescribed by the Rules. This ensures that the primary navigational signals remain unambiguous and effective, preventing confusion for other vessels attempting to determine the status of the vessel.