单项选择题 When a user’s computer is first turned on, they see a lock symbol and a blinking cursor. Which of the following was configured in the BIOS to show this?（）

单项选择题 A technician needs to replace a computer’s hard drive. Which of the following should thetechnician do FIRST?（）

单项选择题 A technician replaces a computer’s NIC with a wireless card. The user wants to save the NIC.Which of the following should the technician use to preserve the NIC? （）