In an NFV environment, what is the role of an SDN controller?

In an NFV environment, what is the role of an SDN controller?
A . Dynamically controls all of the software components
B . Spins up the VMs that are required to build the NFVs
C . Dynamically scales up and scales down VM resources
D . Connects the virtualized networking devices through a common policy-based model

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Answer: D