WhichoptiondescribesthedefaultrolesavailabletoRBAConCiscoNexusswitches?()

A.admin，operator，network-admin，andnetwork-operator

B.admin，read-only，network-admin，andnetwork-operator

C.vdc-admin，vdc-operator，network-admin，andnetwork-operator

D.vdc-admin，vdc-operator，network-admin，andnetwork-operator（forNexus7000）andnetwork-adminandnetwork-operator（forotherNexusswitches）

E.adminandread-only