Which of the following is wrong about the management of Internet users?

Which of the following is wrong about the management of Internet users?
A .  Each user group can include multiple users and user groups
B .  Each user group can belong to multiple user groups
C . The system has a default user group by default, which is also the system default authentication domain.
D .  Each user belongs to at least one user group, also can belong to multiple user groups

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Answer: B