A customer wants to upgrade an existing pSeries system. In addition to retrieving the IBM configuration records， what else should be done to ensure an accurate upgrade quote is provided？（）

A. Request that the pSeries technical specialist provide the discount percentage to the customer.
B. Run both eConfig and PCRS6000 to ensure that both configurators provide the same upgrade quote.
Confirm with the customer that the installed inventory accurately reflects what is actually installed.
D. Provide options to the customer so they can choose the most appropriate upgrade for their environment.