What is true regarding Open Flow and VXLAN for SDN?

What is true regarding Open Flow and VXLAN for SDN?
A . OpenFlow is fully compatible with VMware NSX virtualization solutions, while VXLAN is only partially compatible.
B . OpenFlow interfaces with the switch data plane, while VXLAN creates overlay tunnels between hypervisors without changing the physical infrastructure.
C . OpenFlow offers both pure and hybrid mode, while VXLAN requires the physic network infrastructure device to operate in a pure SDN mode.
D . Open Flow is an open standard and is not vendor dependent, while VXLAN is a proprietary solution

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Answer: B