Explanation: SARTs (Search and Rescue Transponders) operate by transmitting a unique sweep of 12 dots on X-band radar frequencies (9.2-9.5 GHz) when activated. Even during a test, a SART emits this signal. If testing is prolonged or conducted in an area where other vessels are operating their radars (like a port or at sea), their radar systems could pick up the SART's test signal. This could lead to a severe misinterpretation, as the signal mimics a real distress situation, potentially initiating an unnecessary search and rescue operation. Therefore, regulations require strict limits on testing duration to prevent such false alarms and interference. Option A is incorrect because "burn-in" is an outdated issue related to CRT displays and not relevant to modern radar systems or how SART signals interact with them. Option C is incorrect; while electronics can overheat, the primary reason for limiting SART testing duration is preventing signal misuse, not primarily ventilation concerns. Option D is incorrect; two SARTs transmitting simultaneously would cause interference, making both signals harder to detect or interpret, but would not physically damage either unit.