What is a best practice concerning voice traffic and dynamic segmentation on AOS-CX switches?

What is a best practice concerning voice traffic and dynamic segmentation on AOS-CX switches?
A . Controller authentication and user-based tunneling of the voice traffic
B. Switch authentication and user-based tunneling of the voice traffic
C. Controller authentication and port-based tunneling of the voice traffic
D. Switch authentication and local forwarding of the voice traffic

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Answer: D