Mike, a technician, is working on a computer and the air is dry. Which of the following choices is the BEST option for Mike to use?（）

• A、Use a portable anti-static pad and wrist strap, ensuring all components remain on the mat, and the wrist strap is connected to the mat.
• B、Leave the computer plugged in and running, to stabilize the power, and keep one hand on the case at all times while working on the unit.
• C、Use a wrist strap, connecting it to the computer case. Leave the computer plugged into the outlet for grounding.
• D、Advise the customer it is best if the computer is taken back to the shop for repair, so it will be in a controlled temperature environment.