Which statement about the Cisco NAC Guest Server that is deployed in wireless guest access implementations is true?

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Which statement about the Cisco NAC Guest Server that is deployed in wireless guest access implementations is true?

A. The Cisco NAC Guest Server integrates with the Cisco WCS through the RADIUS protocol.
B. The Cisco NAC Guest Server can be used in place of Cisco WCS Lobby Ambassador functionality for guest provisioning and reporting. The Cisco WCS is still needed for WLAN management.
C. The Cisco WLC acts as the guest accounts provisioning portal, and the Cisco NAC Guest Server acts as the captive portal capturing web requests from preassigned "guest ports" and requesting authentication.
D. Guest accounts on the Cisco NAC Guest Server can be created using the Cisco WCS Lobby Ambassador feature.