Which of the following lines should be added to smb.conf to use authenticate users against the Kerberos domain bc.ep.kerberos.biz?

A.
kerberos = bc.ep.kerberos.biz

B.
realm = bc.ep.kerberos.biz

C.
krb5 = /etc/krb5.conf

D.
krb5 workgroup = bc.ep.kerberos.biz