What characteristic best describes a magstripe reader?

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Question:
What characteristic best describes an AR headset?

an input device that reads encoded information from the back of plastic cards
an input device that provides verification of package delivery by digitizing a written name
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