An Elastic Beanstalk application has a tested replacement environment. The team wants a controlled environment cutover while retaining the old environment for recovery. Which supported mechanism should it evaluate?

1. Rename a local ZIP file without deploying it to the replacement environment.
2. Swap environment CNAMEs after validation and account for connection and DNS behavior.
3. Assume creating the environment automatically migrates every stateful dependency.
4. Delete the old environment before verifying the new one serves requests.