You are attempting to connect to your Google Kubernetes Engine (GKE) cluster using `kubectl` from Cloud Shell. Your GKE cluster has a public endpoint. When running the following command in Cloud Shell: ```shell gcloud container clusters get-credentials <cluster-name> \ --zone <zone> --project <project-name> ``` You observe that `kubectl` commands time out without any error message. What is the most probable cause of this issue? | Google Professional Cloud Developer Quiz - LeetQuiz