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What characteristic best describes a projector?

a head$-$mounted device that provides head$-$motion and eye$-$tracking sensors and displays three$-$dimensional images

a head$-$mounted device that superimposes images and audio over a real world image and can provide users immediate access to information about their real surroundings

an output device used to present information from a laptop onto a screen

an output device that uses LED, LCD, or OLED technology