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An insurance firm is using AWS CloudFormation for deploying its applications in AWS. The firm has a multi-tier web application that stores financial data in an Amazon RDS MySQL database in a Multi-AZ deployments configuration. The firm instructed its DevOps Engineer to upgrade the RDS instance to the latest major version of MySQL database. It is of utmost importance to ensure minimal downtime when doing the upgrade to avoid any business disruption. Which of the following should the engineer implement to properly upgrade the database while minimizing downtime?