Kubernetes starts with four initial namespaces: default, kube-system, kube-public, and kube-node-lease. The default namespace is used for objects with no other namespace. kube-system is reserved for objects created by the Kubernetes system. kube-public is readable by all users and used for public resources. kube-node-lease holds lease objects associated with node heartbeats. The other options are incorrect because they either omit kube-node-lease or use non-existent namespaces like system, kube-default, kube-main, or kube-primary.
