which of the following actions will you not take before beginning installation or removal of anyNON-PNP hardware device inside the computer case?（）

1. A Place all the hardware components in static proof bags.
2. B Remove all the jumpers from the motherboard. 正确答案
3. C Switch off the main power and remove the power cord
4. D Use an anti-static wrist strap.
5. E Turn off the computer.
6. F Place the computer on the anti-static mat