Why should you identify the model and version of the computer before performing service?

A.
The hardware might have changed between different versions of the same computer model.

B.
You might find an updated service manual for the product you are servicing, which can only be
determined by searching for the exact model and version.

C.
The model and version together can be decoded to show you exactly what shipped in the initial
configuration of the product.

D.
The computer model is the only important information because each component has a
replacement part number.