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An application is hosted in Elastic Beanstalk, which is currently running in Java 7 runtime environment. A new version of the application is ready to be deployed, and the developer was tasked to upgrade the platform to Java 8 to accommodate the changes. All user traffic must be immediately directed to the new version. If problems arise, the developer should be able to quickly revert to the previous version. Which of the following is the MOST appropriate action that the developer should do to upgrade the platform?