Correct Response: B. A GPS device can be very useful for determining one's location relative to a known landmark or destination. It accomplishes this through triangulation of satellite signals. A is incorrect because electronic tags typically use Bluetooth Low Energy radio signals, and not GPS to locate items. GPS does not work well within a house because satellite signals do not penetrate solid structures very well. Additionally, GPS technology is not precise enough to locate items within a house. C is incorrect because GPS does not work well within a building, especially for determining altitude. D is incorrect because GPS is not precise enough to determine exactly when a runner reaches the finish line.
