Which statement about deploying web authentication within a Cisco Unified (AireOS controllers) wireless solution is true?

Which statement about deploying web authentication within a Cisco Unified (AireOS controllers) wireless solution is true?
A . When configuring Layer 3 security, the controller forwards DNS traffic to and from wireless clients prior to authentication in absence of an explicit deny rule for DNS traffic in the pre-auth AC
C . When configuring a WLAN for local web authentication, you must use the WLC local login page.
D . When configuring a WLAN for local web authentication, you must configure a pre-auth ACL to allow DNS traffic.
E . When configuring local web authentication, the user must obtain an IP address and must be able to resolve the WLC hostname.

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Answer: D