单项选择题Thecustomerhasadedicatedinkjetfaxmachinethatisusedtosendandreceivefaxesonlyfromthecorporateoffice.Theusercomplainsofstreaksonthereceivedfaxeswhiletheinternalself-printsarefine.Whichofthefollowingshouldatechnicianrecommend?()
A.Clean the scanner glass on the distant machine.
B.Clean the scanner glass on the local machine.
C.Clean the printer head on the local machine.
D.Call the telephone company to increase the line signal level.