What are the features of UltraVR storage replication disaster recovery? (Multiple choice)

What are the features of UltraVR storage replication disaster recovery? (Multiple choice)
A . no need to install agent software inside a virtual machine
B . support the entire virtual machine (including system volume and data volume) disaster recovery
C . can be one-button switch disaster, disaster drills and planned migration to reduce disaster recovery administrator manual operation
D . no requirement for storage devices

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Answer: ABC