Which solution will meet these requirements?
Deploy the application on an Amazon EC2 instance, and create an AMI of the instance. Use the AMI to create an automatic scaling launch configuration that is used in an Auto Scaling group. Use Elastic Load Balancing to distribute traffic. When changes are made to the application, a new AMI will be created, which will initiate an EC2 instance refresh.
Use Amazon Lightsail to deploy the application. Store the application in a zipped format in an Amazon S3 bucket. Use this zipped version to deploy new versions of the application to Lightsail. Use Lightsail deployment options to manage the deployment.
Use AWS CodeArtifact to store the application code. Use AWS CodeDeploy to deploy the application to a fleet of Amazon EC2 instances. Use Elastic Load Balancing to distribute the traffic to the EC2 instances. When making changes to the application, upload a new version to CodeArtifact and create a new CodeDeploy deployment.
Use AWS Elastic Beanstalk to host the application. Store a zipped version of the application in Amazon S3. Use that location to deploy new versions of the application. Use Elastic Beanstalk to manage the deployment options.
Explanations:
While deploying the application on an EC2 instance and using AMI for Auto Scaling and Elastic Load Balancing supports scaling and deployment, it does not provide an efficient mechanism for blue/green deployments or A/B testing out of the box. It would require custom management for these strategies.
Amazon Lightsail is a simpler service and does not support blue/green deployments or A/B testing effectively. It also lacks advanced deployment management features compared to more robust AWS services like Elastic Beanstalk or EC2 with Elastic Load Balancing.
AWS CodeArtifact is primarily for artifact storage, not deployment. While CodeDeploy and Elastic Load Balancing can enable deployment, this setup does not directly facilitate blue/green deployments or A/B testing without more custom configurations and cannot natively provide these features.
AWS Elastic Beanstalk is fully managed and supports blue/green deployments as well as A/B testing out of the box. It also integrates seamlessly with Amazon S3 for application version management and allows for automated deployment with rollback capabilities. This meets all the stated requirements.
I appraise that the answer is:
Use AWS Elastic Beanstalk to host the application. Store a zipped version of the application in Amazon S3. Use that location to deploy new versions of the application. Use Elastic Beanstalk to manage the deployment options.