A. Configure a network lockdown policy on the endpoint profiles.
B. Configure a geography address object as the source for a deny policy.
C. Configure geofencing to restrict access from the required countries.
D. Configure source IP anchoring to restrict access from the specified countries.
Explanation:
Geofencing allows the administrator to restrict or allow access to FortiSASE services based on the geographic location of the endpoints, effectively blocking connections from specified countries.