In the Agile Controller admission control scenario, the description of the role of the RADIUS server/client, which is correct?

In the Agile Controller admission control scenario, the description of the role of the RADIUS server/client, which is correct?
A . Agile Controller integrates all functions of RADIUS server and client
B . The Agile Controller acts as a RADIUS server, and the user terminal acts as a RADIUS client
C . The authentication device (such as an 802.1x switch) acts as a RADIUS server, and the user terminal acts as a RADIUS client
D . The Agile Controller acts as a RADIUS server, and the authentication device is a RADIUS client

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Answer: D