You manage a microservices application on Google Kubernetes Engine (GKE) using Istio. You secure the communication channels between your microservices by implementing an Istio AuthorizationPolicy, a Kubernetes NetworkPolicy, and mTLS on your GKE cluster. You discover that HTTP requests between two Pods to specific URLs fail, while other requests to other URLs succeed. What is the cause of the connection issue?

A. A Kubernetes NetworkPolicy resource is blocking HTTP traffic between the Pods. B. The Pod initiating the HTTP requests is attempting to connect to the target Pod via an incorrect TCP port. C. The Authorization Policy of your cluster is blocking HTTP requests for specific paths within your application. D. The cluster has mTLS configured in permissive mode, but the Pod's sidecar proxy is sending unencrypted traffic in plain text.