Select all that apply.

• A

  When the primary node is faulty, the system automatically triggers a switchover for disaster recovery and transfers all services to the standby node for processing.

• B

  Data generated during the period when the standby node takes over services is synchronized to the local gateway.

• C

  In normal conditions, data can be synchronized bidirectionally between the primary and standby nodes.

• D

  After the primary node recovers from a fault, data generated during the period when the standby node takes over services will be lost.