Which of the following additional devices should the administrator install to help manage this network?

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A network administrator is installing a campus network of two routers, 24 switches, 76 APs, and 492 VoIP phone sets .

Which of the following additional devices should the administrator install to help manage this network?
A . VoIP PBX
B . Content filter
C . RADIUS server
D . Wireless controller

Answer: D