How does the HP VAN SDN Controller discover multi-hop links that cross non-OpenFlow enabled switches?

An organization is deploying an HP SDN solution in its legacy network. The network includes OpenFlow-enabled devices and legacy devices that do not support OpenFlow.
How does the HP VAN SDN Controller discover multi-hop links that cross non-OpenFlow enabled switches?
A. The controller uses ARP to discover all devices on the network and then uses OpenFlow to determine whether each device is OpenFlow-enabled.
B. The controller broadcasts LLDP packets to discover whether connected switches are OpenFlow-enabled and uses this information to create an OpenFlow topology.
C. The controller instructs OpenFlow-enabled switches to broadcast BDDP packets that pass through legacy switches to OpenFlow-enabled switches, which send to the controller.
D. The controller broadcasts BDDP packets that pass through legacy switches to OpenFlow-enabled switches, which send to the controller.

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