In a C/S service model among a VM cluster spanning multiple data centers, which method can not support cross-DC traffic switching upon a VM migration when external users access a data center?

In a C/S service model among a VM cluster spanning multiple data centers, which method can not support cross-DC traffic switching upon a VM migration when external users access a data center?
A . Inject the host route of the VM using CE12800’s RHI feature (EVN all-active gateway features)
B . Inject the host route of the VM using the SLB’s RHI feature.
C . Use MPLS tunneling technology to ensure optimal access paths.
D . Change the service model to B/S and use a GSLB to ensure optimal access paths

Answer: A

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