Why the need to add both groups `"apps"` and `"extensions"` for roles managing . . .

Kubernetes
#1

k8s man:
Why the need to add both groups "apps" and "extensions" for roles managing deployments ? deployment resource does not exist under extensions!

#2

Mohamed Ayman:
The old version of K8s uses the extensions group and the newer version use apps. So, when you add both, it will be work on any version of K8s.

#3

k8s man:
thank you @Mohamed Ayman