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?

A. Create a Cloud SQL instance in one zone, and create a failover replica in another zone within the same region. B. Create a Cloud SQL instance in one zone, and create a read replica in another zone within the same region. C. Create a Cloud SQL instance in one zone, and configure an external read replica in a zone in a different region. D. Create a Cloud SQL instance in a region, and configure automatic backup to a Cloud Storage bucket in the same region.