A customer needs an Oracle Database Server. Based on the customer’s sizing data， the IBM Oracle Competency Center has determined that the server requirements can be met with a 4-way p5-550 or a 4-way p5-570. If the pSeries technical specialist proposes a p5-570 versus a p5-550 system， what key differences should be pointed out to the customer？（）

A. The p5-570 is rack mounted but the p5-550 is not.
B. The p5-570 will provide more growth， but at a higher cost.
C. The p5-570 is 200-240 volt only and the p5-550 is 110 volt only.
D. The p5-570 needs a special feature to become a deskside machine.