You are the lead developer for a company that provides a financial risk calculation API. The API is built on Cloud Run and has a gRPC interface. You frequently develop optimizations to the risk calculators. You want to enable these optimizations for select customers who registered to try out the optimizations prior to rolling out the optimization to all customers. Your CI/CD pipeline has built a new image and stored it in the Artifact Registry.
Which rollout strategy should you use?

A. Migrate the traffic to the new service by setting Cloud Run’s traffic split based on the percentage of registered customers. B. Migrate the traffic to the new service by using a blue/green deployment approach. C. Migrate the traffic to the new service by using a feature flag for registered customers. D. Migrate the traffic to the new service and enable session affinity for Cloud Run.