A manufacturing customer has liminted space remaining in their data center and is concerned about rising power costs. The customer applications require very large amounts of memory. They want server redundancy and no downtime. Which of the following architectural features should be discussed with them？（）

• A、iDataPlex with vSphere
• B、Four x3550 M3 servers，vSphere and racks
• C、BladeCenter， HX5 blades and vSphere
• D、One x3950 X5 servers andvSphere