Which of the following precautions are fundamental steps to prevent ESD damage during a repair? (Choose two.)

Which of the following precautions are fundamental steps to prevent ESD damage during a repair? (Choose two.)
A . Clean ESD mats regularly.
B . Apply a display protective cover on top of physically damaged displays.
C . Avoid synthetic materials into the work area.
D . Use a battery cover whenever the case is removed from the device.
E . Discard used screws.

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Answer: AC