Refer to the exhibit.

According to the exhibit, the RADIUS server configuration on FortiGate points to FortiAuthenticator, which is acting as an authentication proxy and is configured to relay all authentication requests to a remote Windows AD server using LDAP. However, LDAP does not support MSCHAP2 authentication, which is required for RADIUS. Therefore, option A is true because on FortiAuthenticator, enabling Windows Active Directory Domain Authentication will add FortiAuthenticator to the Windows domain and allow it to use MSCHAP2 authentication with the AD server. Option C is also true because on FortiAuthenticator, changing the back-end authentication server from LDAP to RADIUS will allow it to use MSCHAP2 authentication with the AD server. Option B is false because on FortiGate, configuring the NAS IP setting on the RADIUS server will not affect the MSCHAP2 authentication, but rather the source IP address of the RADIUS packets. Option D is false because on FortiGate, updating the Secret setting on theRADIUS server will not affect the MSCHAP2 authentication, but rather the shared secret between FortiGate and FortiAuthenticator.