Which statement about OpenStack and ACI is true?

A.
The Nova ML2 plug-in maps APIs into the ACI policy model.

B.
The Cisco APIC driver communicates northbound using the OpFlex plug-in.

C.
Integration can leverage a Cisco APIC plug-in or a Group Policy plug-in.

D.
The Cisco APIC driver is used in place of an OVS driver to communicate to the virtual
machine managers.