In the Scenario of Database Protection, When the Slave Uses

In the scenario of database protection, when the slave uses the virtual snapshot to verify LUN data consistency on the production end and the DR end and the disaster recovery end LUN database can not be started normally.  Which of the following are the possible reasons for this? (multiple choice)

A) After a snapshot of the LUN of the redundancy site is created, the snapshot is not activated at the same time
B) Disaster recovery data stored in the Cache, not yet written to the hard disk
C) When creating a snapshot on the disaster recovery end LUN The production end is copying data to the disaster recovery end
D) The production end and disaster recovery end adopt the disaster recovery solution of incremental LUN copy. The incremental data is abnormally interrupted during the synchronization process and has not been recovered