What stage in the registration process in this check performed?

An administrator enabled the Pre-auth check for their guest self-registration.
At what stage in the registration process in this check performed?
A. after the user clicks the login button and after the NAD sends an authentication request
B. after the user self-registers but before the user logs in C. after the user clicks the login button but before the NAD sends an authentication request
D. when a user is re-authenticating to the network
E. before the user self-registers

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