When a customer is scanning from their multifunction device, using the automatic document
feeder, a black line appears on the media output. When the customer scans from the exposure
glass, there is no black line on the media output. Which of the following is the MOST likely cause
of the black line?

A.
Contamination on the laser mirror

B.
Contamination on the lens unit

C.
Dirty sensors in the scan feed unit

D.
Contamination on the slit glass