With regard to GPS, a civilian receiver may be capable of achieving the same accuracy as a military receiver if __________.

Correct Answer: Option C — selective availability is set to zero

Selective Availability (SA) was a deliberate degradation of GPS signals by the Department of Defense to limit civilian accuracy. When SA was set to zero in 2000, civilian receivers gained the ability to achieve significantly higher precision, approaching the accuracy levels previously reserved for military-grade equipment.