According to Apple Technician Guides, what should be completed before performing any take-apart steps when replacing a part in any Apple product?

A.
Disconnect and reconnect all internal cables.

B.
Lay the product on its side so it will not fall over.

C.
Discharge the CRT and establish an ongoing ground.

D.
Gather all necessary tools and perform all preliminary steps.

E.
Order all available service parts for the appropriate configuration of the product.