Explanation: When a Search And Rescue Radar Transponder (SART) is activated and interrogated by an X-band radar pulse (typically found on marine vessels), it transmits a series of 12 identical sweep signals. Each sweep quickly covers the X-band radar frequency range. On the radar display, each of these 12 sweeps appears as an equally spaced dot extending outwards from the SART's actual position along its bearing line. This unique pattern of 12 equally spaced dots is specifically designed to clearly identify a SART and distinguish it from other radar targets, indicating a distress situation. The other options are incorrect: A series of dashes or spirals are not the characteristic display for an X-band radar SART. While AIS SARTs might appear differently on an AIS display, the question refers to a *radar* transponder on a *RADAR* display. The number twenty dashes is also incorrect for this specific device.