技術者は PC のマザーボードを交換する必要があります。技術者は PC をシャットダウンします。技術者が次に実行すべき手順は次のうちどれですか?
正解:B
Explanation Removing the power cord is the first step to ensure the safety of the technician and the PC components. This will prevent any electrical shock or damage that may occur if the PC is still connected to a power source. The technician should also press the power button to drain any residual power from the capacitors.