Which of the following would most likely prevent a SART's signal from being detected?

Correct Answer: Option C — The rescue personnel were monitoring the 10-CM radar.

SARTs are engineered specifically for X-band (3-cm) radar detection. Because S-band (10-cm) radars operate on a significantly different frequency, they are incapable of detecting the SART's response signal. Consequently, rescue personnel monitoring only S-band radar will fail to identify the SART's location during a search.