题目内容
（请给出正确答案）
[主观题]
What are three common reasons why customers are saying that they need to evolve their data center？ （）
A.demand among users for access to information anytime, anywhere
B.desire to use the same vender for desktop and server deployments
C.existing equipment has reached and of life
D.increasing operational costs of managing data centers
E.architectures that is inflexible and inefficient
F.selecting best-performing vendors for each individual component
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