When can a high availability disaster recovery (HADR) role switch operation be performed in a DB2 pureScale environment?
A. When crash recovery is occurring on the standby cluster.
B. When all the log streams are in peer or assisted remote catchup state.
C. When the primary database is not connected to the standby database.
D. All the log streams are in remote catchup state and the synchronization mode is NEARASYNC.
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