Which of the following options about the big two-tier network architecture is correct?

Which of the following options about the big two-tier network architecture is correct?
A . The so-called “big layer” refers to the implementation of Layer 2 data communication across networks and across DCs through technologies such as Overlay.
B . All mainstream server virtualization technologies can achieve different levels of virtual machine online migration, and the MAC address and IP address of the virtual machine are unchanged before and after the virtual machine migration. The source and destination of the migration may not be in one VLA
D . The next-generation data center network requires higher service carrying capacity than traditional networks. Various applications (such as Oracle RAC, etc.) require a three-layer network to provide network environment of low-latency, high-throughput, and MAC-layer direct exchange for their services.
E . Providing intelligent service resource pools for a wider range of access layers, intelligent services are required to be centrally deployed, which requires a three-layer convergence layer of intelligent services.

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Answer: A