Does this describe the role of Control Groups (cgroups) when used with a Docker container? Solution: role-based access control to clustered resources

Will this command mount the host's '/data' directory to the ubuntu container in read-only mode? Solution: 'docker run --add-volume /data /mydata -read-only ubuntu' 

Is this statement correct? Solution.A Dockerfile stores persistent data between deployments of a container

The Kubernetes yaml shown below describes a clusterIP service.

Is this a correct statement about how this service routes requests? Solution: Traffic sent to the IP of this service on port 8080 will be routed to port 80 in a random pod with the label aPP: nginx. 

Does this command display all the pods in the cluster that are labeled as 'env: development'? Solution: 'kubectl get pods --all-namespaces -label env=development'