Which command should be used to verify that a user can authenticate to the new cluster?

Which command should be used to verify that a user can authenticate to the new cluster?
A . oc connect -u <user name> -p <password>
B . oc ssh <master cluster name URL> -u <username> -p <password>
C . oc login <master cluster name URL>
D . oc connect <master cluster name URL>

Answer: D