C is wrong. assigning a user to a group doesn't achieve anything on it's own.
A is correct: As well as the DNS service, the firewall policy must specify the allowed protocols, such as HTTP, HTTPS, FTP, and Telnet. If the firewall policy that has authentication enabled does not allow at least one of the supported protocols used for obtaining user credentials, the user will not be able to authenticate.
C is correct... under security profiles (web filter for example) at the firewall policy, you set the action to Authenticate and then select the group to actively authenticate
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