About the dual-standby function of U1900 Series Unified Gateway, which of the following statement is correct? (Multiple Choice)

About the dual-standby function of U1900 Series Unified Gateway, which of the following statement is correct? (Multiple Choice)
A . When the master node fails, the system automatically triggers the switchover mechanism, and all business is transferred to the standby node for processing.
B . Master node returns normal from a failure, the data during standby node takeover business will be synchronized to the Master node
C . Under normal circumstances, the master node and standby node can synchronize data
D . Master node returns normal from a failure, the data during standby node takeover business will be lost after the master node recovery

Answer: AD

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