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A CTO of a leading insurance company has recently decided to migrate its online customer portal to AWS. The customers will use the online portal to view the paid insurance premiums and manage accounts. For improved scalability, the application should be hosted in an Auto Scaling group of On-Demand Amazon EC2 instances with a custom Amazon Machine Image (AMI). The same architecture will also be used for the non-production environments (DEV, TEST, and STAGING). The DevOps Engineer is instructed by the CTO to design a deployment strategy that securely stores the credentials of each environment, expedites the startup time for the EC2 instances, and allows the same AMI to work in all environments. How should the DevOps Engineer set up the deployment configuration to accomplish this task?