What is the recommended approach to securing the OpenFlow messages?

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.

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