B is incorrect.
https://help.fortinet.com/fos60hlp/60/Content/FortiOS/fortigate-ipsecvpn/Defining_VPN_Policies/Defining_Policies_for_Policy_and_Route.htm?Highlight=route%20based%20vpn
B- action can be set to Accept,Deny and learn so is wrong.A is correct :
Adding XAuth authentication
Extended Authentication (XAuth) increases security by requiring additional user authentication in a separate exchange at the end of the VPN Phase 1 negotiation. The FortiGate unit challenges the user for a user name and password. It then forwards the user’s credentials to an external RADIUS or LDAP server for verification.
Implementation of XAuth requires configuration at both the FortiGate unit and the FortiClient application. For information about configuring a FortiGate unit as an XAuth server, see Phase 1 parameters. The following procedure explains how to configure the FortiClient application.
So the correct answers are A&C.
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