Which option describes the default roles available to RBAC on Cisco Nexus switches?()
A、 admin, operator, network-admin, and network-operator
B、 admin, read-only, network-admin, and network-operator
C、 vdc-admin, vdc-operator, network-admin, and network-operator
D、 vdc-admin, vdc-operator, network-admin, and network-operator (for Nexus 7000) and network- admin and network-operator (for other Nexus switches)
E、 admin and read-only