What characteristic best describes a VR headset?

What characteristic best describes a VR headset?

• 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