A. Turn off the Multi-AZ feature, add the read replica, and turn Multi-AZ back on again.
B. Set the backup retention period to 0, add the read replica, and set the backup retention period to 7 days again.
C. Restore a snapshot to a new RDS DB instance and add the DB instance as a replica to the original database.
D. Add the new read replica without making any other changes to the RDS database.

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