To provide redundancy, a company has multiple data centers that use server virtualization. What is a networking requirement for this scenario?
A. less bandwidth at the server access layer and more bandwidth at the distribution layer than in a non-virtualized network
B. physical network segmentation and isolation implemented at Layers 1 through 7
C. localized storage volumes that are isolated within each data center
D. extension of Layer 2 connectivity across the data centers
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