A user wants to establish an FTP session to a server behind an SRX device but must authenticate to a Web page on the SRX device for additional authentication.Which type of user authentication is configured?（）

A. [edit security policies from-zone Private to-zone External] user@host# show policy allowTransit { match { source-address PrivateHosts;destination-address ExtServers; application ExtApps; } then { permit { tunnel { ipsec-vpn VPN; } } log { session-init; } } }
B. [edit security policies from-zone Private to-zone External] user@host# show policy allowTransit { match { source-address PrivateHosts; destination-address ExtServers; application ExtApps; } then { permit { tunnel { ipsec-vpn VPN; } } count { session-close; } } }
C. [edit security policies from-zone Private to-zone External] user@host# showpolicy allowTransit { match { source-address PrivateHosts; destination-address ExtServers; application ExtApps; } then { permit { tunnel { ipsec-vpn VPN;} } log { session-close; } } }
D. [edit security policies from-zone Private to-zone External] user@host# show policy allowTransit { match { source-address PrivateHosts; destination-address ExtServers; application ExtApps; } then { permit { tunnel { ipsec-vpn VPN; log; count session-close; } } } }

A. A client group is a list of clients associated with a group.
B. A client group is a list of groups associated with a client.
C. Client groups are referenced in security policy in the same manner in which individual clients are referenced.
D. Client groups are used to simplify configuration by enabling firewall user authentication without security policy.

A.1
B.2
C.4
D.8