How do you protect yourself from electrical shock when servicing HP notebooks?

A.
Unplug the computer, but do not remove the battery because the battery provides the computer
with a grounded connection when you replace parts

B.
Unplug the computer, remove the battery, and touch a screwdriver to the battery connection
contacts to remove residual power in the device.

C.
Unplug the computer, remove the battery, and allow the computer to stand for a few minutes
before accessing internal components.

D.
Remove the battery, but do not unplug the computer because the power supply provides a
grounded connection when you replace parts.