Kubernetes creates a set of namespaces by default when a cluster is initialized. The standard initial namespaces aredefault,kube-system,kube-public, andkube-node-lease, makingAcorrect.
defaultis the namespace where resources are created if you don’t specify another namespace. Many quick-start examples deploy here, though production environments typically use dedicated namespaces per app/team.
kube-systemcontains objects created and managed by Kubernetes system components (control plane add-ons, system Pods, controllers, DNS components, etc.). It’s a critical namespace, and access is typically restricted.
kube-publicis readable by all users (including unauthenticated users in some configurations) and is intended for public cluster information, though it’s used sparingly in many environments.
kube-node-leaseholds Lease objects used for node heartbeats. This improves scalability by reducing load on etcd compared to older heartbeat mechanisms and helps the control plane track node liveness efficiently.
The incorrect options contain non-standard namespace names like “system,” “kube-main,” or “kube-primary,” and “kube-default” is not a real default namespace. Kubernetes’ built-in namespace set is well-documented and consistent with typical cluster bootstraps.
Understanding these namespaces matters operationally: system workloads and controllers often live in kube-system, and many troubleshooting steps involve inspecting Pods and events there. Meanwhile, kube-node-lease is key to node health tracking, and default is the catch-all if you forget to specify -n.
So, the verified answer isA: default, kube-system, kube-public, kube-node-lease.
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