What should be done after reassembling a laptop, but before installing the battery or AC adapter?

a$.$

Gently shake the laptop to ensure nothing is loose inside of the case

b$.$

Press the power button to drain any electricity in the system

c$.$

Remove the keyboard so that you can test proper voltage on the motherboard once the battery and$/$or AC adapter are reconnected.

d$.$

Attack ESD strap alligator clip to a different grounding source