You need to deploy a new version of an Elastic Beanstalk application such that the application remains at full capacity with no downtime, while minimizing the cost of any extra resources used during deployment. Which Elastic Beanstalk deployment policy should you choose?

Rolling with additional batch deployments maintain full capacity by launching a new batch of instances before taking any old instances offline. This ensures no downtime and minimizes cost by only temporarily increasing the number of instances. All at once deployments cause downtime as all instances are updated simultaneously. Blue/green deployments create an entirely new environment, doubling resource costs for the duration of the deployment. Immutable deployments replace instances one by one with new ones, which can cause temporary capacity reduction if not carefully managed or if the environment is not scaled up beforehand.