Explanation: SARTs (Search and Rescue Transponders) are designed to be detected by X-band (3-CM) radar, which operates around 9 GHz. They do not respond to S-band (10-CM) radar, which operates around 3 GHz. Proper mounting ensures the SART's antenna has a clear line of sight, maximizing its detection range. Let's evaluate the options: * **A) 3-CM radar is correct, but improper mounting** would severely hinder detection. * **B) Improper mounting and 10-CM radar** would both prevent detection. * **C) 10-CM radar** would prevent detection, regardless of proper mounting, because SARTs don't respond to it. * **D) The SART is properly mounted, and rescue personnel are monitoring 3-CM radar.** These are the ideal conditions for a SART to be detected, meaning detection would most likely *not be prevented*. Therefore, option D describes the scenario where the SART signal would most likely be detected.