Which of the following is false regarding overlay solutions?

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Which of the following is false regarding overlay solutions?
A . An ‘overlay network’ is a virtual abstraction built on top of an existing physical network.
B . Both VXLAN and TRILL are host-centric overlay solutions.
C . Nuage Networks VNS uses a VXLAN-based overlay solution.
D . Overlay networks are totally transparent to their physical underlay network.

Answer: B