Do NOT wear a grounded ESD wrist strap while working insite an MAC that is plugged into AC power

Which of the following is a valid precaution you should take while working inside an iMac (27-inch, Mid 2010) system that is plugged into AC power but has not yet been powered on?
A. Do not turn the unit upside-down.
B. Avoid putting your fingers near the fans.
C. Make sure you are NOT wearing a grounded ESD wrist strap.
D. Do not touch the processor heat sink because it could burn your fingers.
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