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A company is re-architecting its monolithic system to a serverless application in AWS to save on cost. The deployment of the succeeding new version of the application must be initially rolled out to a small number of users first for testing before the full release. If the post-hook tests fail, there should be an easy way to roll back the deployment. The DevOps Engineer was assigned to design an efficient deployment setup that mitigates any unnecessary outage that impacts their production environment. As a DevOps Engineer, how should you satisfy this requirement? (Select TWO.)