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單項選擇題

Your BladeCenter customer operates multiple geographically dispersed datacenters and needs resilient remote access to servers. 
What is the most cost-effective solution listed below?()

A.Add redundant management modules
B.Individual 1U and 2U servers equipped with Remote Support Adapters
C.Train and deploy highly skilled system administrators to each site
D.Maintain system administrators centrally and dispatch to remote sites when needed

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