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A company is planning to migrate its online customer portal to AWS. It should be hosted in AWS Elastic Beanstalk and use Amazon RDS MySQL in Multi-AZ configuration for its database. A DevOps Engineer was instructed to ensure that the application resources must be at full capacity during deployment by using a new group of instances. The solution should also include a way to roll back the change easily and prevent issues caused by partially completed rolling deployments. The application performance should not be affected while a new version of the app is being deployed. Which is the MOST cost-effective deployment set up that the DevOps Engineer should implement to meet these requirements?