An administrator wants to secure the connection between an HP Provision switch and HP VAN SDN Controller. What is the recommended approach to securing the OpenFlow messages?
A. Use CA-signed certificates on an HP VAN SDN Controller and the HP Provision switches, and then use TLS to secure communication.
B. Use OpenFlow message type 5 on the auxiliary channel to secure OpenFlow messages.
C. Use an IPsec VPN between the HP Provision switch and the HP VAN SDN Controller to secure OpenFlow messages.
D. Use self-signed certificates on an HP VAN SDN Controller and the HP Provision switches, and then use TLS to secure communication.