After QA improvements reduced rollbacks 80%, which two approaches further reduce unplanned production rollbacks? (Choose two.)

Blue/green deployments reduce unplanned rollbacks by providing an identical, pre-tested environment (green) to which traffic can be instantly switched if the new version (blue) fails. This minimizes downtime and allows for immediate rollback to the stable green environment. Fragmenting a monolithic platform into microservices reduces the blast radius of changes. Instead of deploying a large, complex application, smaller, independent services are deployed. If a microservice deployment fails, only that specific service is affected, not the entire platform, making rollbacks more contained and less impactful. Replacing QA with canary releases is a deployment strategy, not a rollback reduction strategy. Reducing or replacing relational databases doesn't directly address deployment-related rollbacks; these are architectural decisions for scalability or data modeling.