You are building the CI/CD pipeline for an application deployed to Google Kubernetes Engine (GKE). The application is deployed by using a Kubernetes Deployment, Service, and Ingress. The application team asked you to deploy the application by using the blue/green deployment methodology. You need to implement the rollback actions. What should you do?

A. Run the kubectl rollout undo command. B. Delete the new container image, and delete the running Pods. C. Update the Kubernetes Service to point to the previous Kubernetes Deployment. D. Scale the new Kubernetes Deployment to zero.