Which choice most accurately describes the licensing components for Cisco Unity Connection?

Which choice most accurately describes the licensing components for Cisco Unity Connection?

A.
port licensing for phone system integration; seat licensing for voice mail, integrated messaging
services, and VPIM licensing

B.
port licensing for phone system integration

C.
end-user licensing based on the number of users for voice mail, IMAP access to voice mail,
voice recognition, Cisco Unity Inbox, and email TTS

D.
port licensing and VPIM licensing