以下哪个是给交换机供电的三个基本步骤的正确顺序? Which of the following is the correct order of the three basic steps for powering up a switch?
A. 检查组件,将电缆连接到交换机,给交换机通电 check the components, connect the cables to the switch, power up the switch
B. 给交换机通电,检查组件,将电缆连接到交换机 power up the switch, check the components, connect the cables to the switch
C. 将电缆连接到交换机,检查组件,给交换机通电。 connect the cables to the switch, check the components, power up the switch