Explanation: A Search and Rescue Transponder (SART) is designed to operate in the X-band frequency range, specifically around 9 GHz (typically 9.2-9.5 GHz). This allows it to be detected by the X-band navigational radars commonly found on ships and aircraft. Statement B incorrectly identifies the SART as a 6 GHz transponder. If a SART transmitted at 6 GHz, it would not be reliably detected by a standard X-band (9 GHz) radar system, which is crucial for its rescue function. Statements A, C, and D are all true characteristics of a SART: * A SART responds to interrogations from a vessel's X-band radar. * It is indeed a 9 GHz transponder, making it detectable by X-band radar systems. * When activated and interrogated, it transmits a distinctive series of 12 equally spaced blips or dots on the radar display, making it easy for rescuers to identify its location.