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How can you restore the original configuration of a Cloud SQL setup where DB-1 is the primary instance with cross-region read replicas DB-2 and DB-3, after promoting DB-2 during a business continuity test and now needing to revert back?
A
Bring DB-1 back online.
B
Delete DB-1, and re-create DB-1 as a read replica in the same region as DB-1.
C
Delete DB-2 so that DB-1 automatically reverts to the primary instance.
D
Create DB-4 as a read replica in the same region as DB-1, and promote DB-4 to primary.
