Ausercomplainsthatacomputermonitorisexperiencingajitter.Replacingthemonitorandvideocarddoesnotfixtheproblem.Whichofthefollowingcouldbecausingtheproblem?()

A.ESD（electrostaticdischarge）

B.motherboard

C.RAMDAC

D.EMI（electromagneticinterference）