A company is using AWS Elastic Beanstalk to manage web applications that are running on Amazon EC2 instances. A developer needs to make configuration changes. The developer must deploy the changes…

All-at-once deployments update all existing instances simultaneously in place, which does not meet the requirement of deploying only to new instances.

Immutable deployments launch a fresh Auto Scaling group with new instances running the new version. If the deployment succeeds, traffic is shifted to the new instances and old ones are terminated, so changes are only applied to new instances.

Rolling deployments update existing instances in batches, modifying currently running instances rather than deploying exclusively to new ones.

Blue/green deployments create a completely new environment (green) with new instances and swap the CNAME or load balancer to direct traffic, meaning the new configuration is deployed exclusively to the new instances.

Rolling with additional batch adds new instances during deployment but also updates existing instances as the roll progresses, so changes are not limited solely to new instances.