About multi-node centralized network, which of the following statement is correct? (Multiple Choice)

About multi-node centralized network, which of the following statement is correct? (Multiple Choice)
A . the central node of centralized networking can be deployed backup machine to achieve disaster recovery
B . U1911 can serve as the central node of centralized networking
C . U1900 series all gateways can be used as a local node of centralized networking
D . U1981 only as a local node of centralized networking

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Answer: ABC