An administrator has configured a FortiGate unit so that end users must authenticate against the firewall using digital certificates before browsing the Internet. What must the user have for a successful authentication? (Select all that apply.)
A. An entry in a supported LDAP Directory.
B. A digital certificate issued by any CA server.
C. A valid username and password.
D. A digital certificate issued by the FortiGate unit.
E. Membership in a firewall user group.