Question: How does a GPS device determine its location on (or at some altitude above) the Earth? a. By triangulating from two known positions b. Through

How does a GPS device determine its location on (or at some altitude above) the Earth? 


a. By triangulating from two known positions 


b. Through a process called trilateration using four satellites 


c. By measuring the phase difference between two radio signals transmitted from a satellite 


d. By using an inertial sensor to determine the distance and direction from the last known position

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