Which three built-in auto-attendant features accompany Cisco Unity Express? (Choose three.)

A.
dial-by-name

B.
single-digit dialing for up to nine users or groups

C.
dial-by-extension

D.
multilevel auto-attendant flows providing dual tone multifrequency – based menus

E.
return-to-operator

F.
three or more voice-mail greetings per user