Which configuration allows User A and User B access to the network, but prevents User C from accessing the network?

Refer to the Exhibit.

In the exhibit, User A has authenticated using 802.1X. User B and User C have not authenticated.
The RADIUS server fails.Which configuration allows User A and User B access to the network, but
prevents User C from accessing the network?

A.
[edit protocols dot1x authenticator]
user@S1# set interface ge-0/0/0.0 server-fail use-cache
user@S1# set interface ge-0/0/1.0 server-fail permit
user@S1# set interface ge-0/0/2.0 server-fail use-cache

B.
[edit protocols dot1x authenticator]
user@S1# set interface ge-0/0/0.0 server-backup if-authenticated
user@S1# set interface ge-0/0/1.0 server-backup if-authenticated
user@S1# set interface ge-0/0/2.0 server-backup deny

C.
[edit protocols dot1x authenticator]
user@S1# set interface ge-0/0/0.0 server-backup if-authenticated
user@S1# set interface ge-0/0/1.0 server-backup permit
user@S1# set interface ge-0/0/2.0 server-backup deny

D.
[edit protocols dot1x authenticator]
user@S1# set interface ge-0/0/0.0 server-fail permit
user@S1# set interface ge-0/0/1.0 server-fail use-cache
user@S1# set interface ge-0/0/2.0 server-fail use-cache