You plan to deploy Cloud SQL using MySQL. You need to ensure high availability in the event of a zone failure. What should you do?
Create a Cloud SQL instance in one zone, and create a failover replica in another zone within the same region.
Create a Cloud SQL instance in one zone, and create a read replica in another zone within the same region.
Create a Cloud SQL instance in one zone, and configure an external read replica in a zone in a different region.
Create a Cloud SQL instance in a region, and configure automatic backup to a Cloud Storage bucket in the same region.
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