Which of the following description for the NIP product interface is wrong?

Which of the following description for the NIP product interface is wrong?
A . The default interfaces of NIP products work in pairs, including the interfaces on the main interface version and the expansion interface card. They are paired in order from the front to the back, such as a01-601.
B . The default working mode is IDS, users can convert to IPS mode as needed.
C . An interface to the internal working is a shared session
D . Interface pairs can be combined as needed to form an interface pair combination. One interface pair is internally shared.

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Answer: B