Exam AWS Certified Developer Associate topic 1 question 82 discussion

D) Correct - This method deploys the new application version to all instances simultaneously. This is the quickest approach, as it doesn't involve any staged rollouts or gradual traffic shifts. However, it can lead to a brief period of downtime while the instances are updated

The fastest deploymenty is "All At Once" because it will terminate all the instances, install the updates and turn on the instances all at the same time. Of course, we can do that because we are in test environment but in production there should be used other techniques

All at once is the fastest

D. All at once deployment method offers the fastest deployment. All at once deployment method updates all instances at the same time, and as a result, the deployment process is faster than other methods such as Immutable, Rolling, and Rolling with additional batch, which can take longer due to the fact that they update instances in batches or gradually.

All at once is potential downtime is not an issue but it has to be fast. So D

https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.deploy-existing-version.html#deployments-scenarios

Correct answer is D

Answer is D