What is the purpose of the Pre-Auth Check?

Refer to the exhibit.

A Web Login Page is configured in ClearPass Guest as shown.
What is the purpose of the Pre-Auth Check?
A. To -re-authenticate users when they’re roaming from one NAD to another.
B. To authenticate users before they launch the Web Login Page.
C. To replace the need for the NAD to send an authentication request to ClearPass.
D. To authenticate users after the NAD sends an authentication request to ClearPass.
E. To authenticate users before the client sends the credentials to the NAD.

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