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