On a multifunction device, a technician observes that a black line is present on a page, running
from the lead edge of the page to the trail edge. Upon further testing, the technician observes that
this only happens when making a copy, but not when receiving a fax or printing a page. In which of
the following sections is the issue MOST likely occurring?

A.
Fuser unit

B.
Developer unit

C.
Scanner unit

D.
Photoconductor unit