How are electromagnetic waves used in a bar-code scanner? O A. X-rays shine on objects, and the rays either pass through or are
absorbed by the objects.
B. Red light shines on a bar code, and light is reflected according to
the black-and-white pattern.
C. An image is produced when a silicon chip releases electrons by
the photoelectric effect.
D. Visible light is reflected off an object and then captured by a
charge-coupled device.