Which of the following descriptions of the networking principles of Huawei flash storage device disk enclosures is wrong?

Which of the following descriptions of the networking principles of Huawei flash storage device disk enclosures is wrong?
A . The P0 port of the disk enclosure is an upstream port and can only be connected to the P1 port of the upper disk enclosure.
B . The P1 port of the disk enclosure expansion module is connected to the P0 port of the next-level disk enclosure expansion module
C . Disk enclosure cascading networking usually adopts full positive connection
D . The interface modules of the two ports on the controller enclosure connected to the same disk enclosure should be symmetrical and have the same port number.

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Answer: A