The correct answer is (c). GPS stands for Global Positioning System. It is a satellite-based navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth. The system is maintained by the United States government and is used by civilian and military users around the world.
(a) Greenwich Polar Satellite is incorrect. There is no such satellite system.
(b) Global Police Surveillance is incorrect. There is no such police surveillance system.
(d) General Pacific Survey is incorrect. There is no such survey system.