How do global positioning systems use elevation points on earth's system to find latitude an longitude?

Global Positioning System (GPS) uses timing signals from four satellites to determine your latitude,longitude, altitude and precise time. The receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is.

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How do global positioning systems use elevation points on earth's system to find latitude an longitude?

Global Positioning System (GPS) uses timing signals from four satellites to determine your latitude,longitude, altitude and precise time.

The answer i think is d