What FortiGate configuration is required to actively prompt users for credentials?

What FortiGate configuration is required to actively prompt users for credentials?
A . You must enable one or more protocols that support active authentication on a firewall policy
B . You must position the firewall policy for active authentication before a firewall policy foe passive authentication.
C . You must assign users to a group for active authentication
D . You must enable the Authentication setting on the firewall policy

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Answer: C