https://kubernetes.io/docs/concepts/overview/kubernetes-api/

Here is a link to kubernetes documentation if you want to learn more about this topic (You don't need it for the exam though):

https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md

https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api_changes.md