A company is using an Amazon RDS for MySQL DB instance for a production application. During the company’s upcoming scheduled maintenance window, a database specialist will perform a major version upgrade to the DB instance. The application is critical, so the company wants to minimize the maintenance time and allow for a rollback if a problem occurs. Which solution will meet these requirements?

Topic #: - All AWS Certified Database - Specialty Questions

A. Enable the automatic upgrade option by using the AWS Management Console. Amazon RDS will apply the upgrade, which will occur during the scheduled maintenance window with no downtime.
B. Create a new DB instance that has the desired version. Configure AWS Database Migration Service (AWS DMS) to migrate the existing data to the new DB instance. Change the DNS records to point to the new DB instance.
C. Create read replica of the DB instance. Upgrade the version on the read replica. Promote the read replica to be the primary DB instance. Direct the application to use the read replica endpoint.
D. Create a read replica of the DB instance. Configure a policy to fall over to the read replica if failure occurs during the upgrade. Upgrade the version on the primary DB instance.

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