What characteristic best describes a monitor?

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Question:
What characteristic best describes a monitor?

an output device used to present information from a laptop onto a screen
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
a head-mounted device that provides head-motion and eye-tracking sensors and displays three-dimensional images
an output device that uses LED, LCD, or OLED technology