What is the function of a controller in controller-based networking?

What is the function of a controller in controller-based networking?
A . It is a pair of core routers that maintain all routing decisions for a campus
B . It centralizes the data plane for the network
C . It is the card on a core router that maintains all routing decisions for a campus
D . It serves as the centralized management point of an SDN architecture

Answer: D

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