What is the function of a control-plane node in a Cisco SD-Access solution?

What is the function of a control-plane node in a Cisco SD-Access solution?
A . to connect APs and wireless endpoints to the SD-Access fabric
B . to connect external Layer 3 networks to the SD Access fabric
C . to implement policies and communicate with networks outside the fabric
D . to run a mapping system that manages endpoint to network device relationships

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Answer: D