What correctly describes the role of OpenFlow in an SDN solution?

What correctly describes the role of OpenFlow in an SDN solution?
A . OpenFlow regulates the communications among teamed SDN controllers, as well as between an SDN controller and a network infrastructure device.
B . OpenFlow integrates the SDN controller into a larger management suite, such as the one provided in the HP Helion CloudSystem solution.
C . OpenFlow is an open standard technology that regulates how the SDN control plane and the application plane communicates.
D . OpenFlow is a communication protocol that an SDN controller can use to control how network devices forward traffic.

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Answer: D