Which layers as the following are included in the Huawei Cloud Data Center Service Architecture Hierarchical Model? (Multiple Choice)

Which layers as the following are included in the Huawei Cloud Data Center Service Architecture Hierarchical Model? (Multiple Choice)
A . The infrastructure layer, such as servers, storage, networking products and so on.
B . Virtualization layer, the realization of virtualization resource pool.
C . Cloud service layer, blending virtualization resource pool, to realize the centralized management and allocation of resources.
D . Application layer, support all types of cloud services.

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Answer: ABCD