Which if the following is correct regarding the Huawei Oceanstor unified storage system multi-planar system design?

Which if the following is correct regarding the Huawei Oceanstor unified storage system multi-planar system design?
A . The service plane uses GE channels for data transmission
B . The service plane connects the host IO channel, disk IO channel and GE switch
C . Plane redundancy between each other, when the business plane fails, allowing the use of control plane transmission of business data
D . When the GE switching channel is faulty, the PCIe switching channel can be used as the backup data transmission channel

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Answer: D