What characteristic best describes an AR headset?

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Question:
What characteristic best describes an AR headset?

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 input device allowing users to pay for a product by tapping their credit card or smartphone on another device
an input device that reads barcodes affixed to most retail products
an input device that reads encoded information from the back of plastic cards