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In a Kubernetes cluster, you have a Service of type NodePort that exposes a web application running in a Pod. The Service is configured with the NodePort 30000 . An external load balancer routes traffic to nodes in the cluster at port 30000 . The application in the Pod relies on a Redis cache. The Redis cache is exposed through another Service named redis-service within the cluster. What are the two best practices to securely isolate and manage traffic flow in this scenario? (Select two)