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AWS Certified Solutions Architect - Professional · AWS
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B is right Blue/green deployments allow for multiple instances of the application to be deployed simultaneously, one in production and one in a standby state (the "blue" instance). This approach provides several benefits, including: Minimal downtime: If an issue arises with the production instance, users can quickly switch to the standby instance without disrupting the application. Easy rollbacks: If issues cannot be resolved, blue/green deployments allow for a quick rollback to the previous version of the application.
Manual code rollback in CodeDeploy: https://docs.aws.amazon.com/codedeploy/latest/userguide/deployments-rollback-and-redeploy.html#:~:text=a%20deployment%20group.-,Manual%20rollbacks,gotten%20into%20an%20unknown%20state.
Option B