Which of the following components is sometimes built into a laptop LCD panel?

The battery is a large, heavy component housed in the base of the laptop chassis, not in the thin LCD panel lid.

SD card readers are external I/O ports built into the side edge of the laptop's base chassis, not integrated into the display panel.

HDMI is a video-output port located on the side of the laptop's base chassis because it requires a physical connector accessible from outside the device.

Microphones are commonly embedded within the thin bezel surrounding the LCD panel - often placed on either side of the webcam at the top of the display assembly - to provide hands-free audio input while keeping the laptop compact.