单项选择题

A.ESD（electrostatic discharge）B.motherboardC.RAMDACD.EM……

A user complains that a computer monitor is experiencing a jitter. Replacing the monitor and video card does not fix the problem. Which of the following could be causing the problem？（）

A.ESD（electrostatic discharge）
B.motherboard
C.RAMDAC
D.EMI（electromagnetic interference）

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