What is a role of NSO?

A、Itautomatesthedeploymentofaccesspointswithitsbuilt-inwirelessLANcontroller.
B、ItmanagesWANinfrastructureusingavirtualswitch.
C、Itprovidesfulllifecyclemanagementofadevice.
D、ItresidesonahypervisorthatrunstheWindowsOS.