Which of the Following Describes a Global Positioning System (GPS)

Which of the following describes a global positioning system (GPS) ?

A) Occurs when a company places active or semi-passive RFID tags on expensive products or assets to gather data on the items' location with little or no manual intervention.
B) Use plastic or conductive polymers instead of silicon-based microchips, allowing them to be washed or exposed to water without damaging the chip.
C) A device that measures the acceleration (the rate of change of velocity) of an item and is used to track truck speeds or taxi cab speeds.
D) A satellite-based navigation system providing extremely accurate position, time, and speed information.