A person holding a G P S device up to the sky. Red lines point from the G P S to satellites. Image by Javiersanp

In order to help us find our exact location, GPS uses signals that are broadcast from and interpreted by .
A.
airplanes . . . receivers
B.
balloons . . . software
C.
aerial photos . . . software
D.
satellites . . . receivers

Please select the best answer from the choices provided
A
B
C
D