In the Huawei Cloud Stack solution, which of the following is wrong about the basic networking design?

In the Huawei Cloud Stack solution, which of the following is wrong about the basic networking design?
A . In a three-layer network, the management plane and the business plane need to be physically isolated.
B . In dual-core networking, the management plane and the business plane are physically isolated
C . In single-core networking, there is no requirement for physical isolation between the management plane and the business plane
D . When single core networking is used, support for combined deployment of management area TOR and business area TOR

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Answer: A