Which option represents the minimal set of groups needed for an OpenStack environment?

A.
Public, Private, Management, Data

B.
Public, Private, Management, Services

C.
Public, Guest, Management, Services

D.
Public, Guest, Management, Data

Explanation:
http://docs.openstack.org/developer/fuel-docs/userdocs/fuel-user-guide/configure-environment/networksettings.html