In Huawei Cloud Stack, which of the following descriptions of the design of various security services is wrong?

In Huawei Cloud Stack, which of the following descriptions of the design of various security services is wrong?
A . The CBH service business plane is deployed in the Pod area and needs to occupy computing node resources.
B . The CSP service management plane is connected to the External-OM plane, eliminating the need to plan an independent network plane
C . HSS service is deployed using virtual machines, which only requires additional cloud platform management node resources, without special hardware requirements
D . WAF only supports single-region deployment. All WAF service components need to be deployed in the same region.

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Answer: D