Explanation: SARTs (Search and Rescue Transponders) are specifically designed to operate in the X-band frequency range, typically 9.2-9.5 GHz, which corresponds to a 3 cm wavelength. When interrogated by an X-band radar, a SART transmits a unique swept-frequency signal back, appearing as a series of 12 dots on the radar display. A search vessel's 10 cm radar operates in the S-band, which is a significantly lower frequency range (around 3 GHz). Because the SART is designed to transmit and receive only within the X-band, it cannot respond to or be detected by an S-band (10 cm) radar. Conversely, a 3 cm radar operates in the X-band and *can* detect a SART. Options A and B describe environmental conditions, but SARTs are electronic devices designed precisely to aid detection in poor visibility, at night, and in heavy seas when visual detection is impossible.