Which pre-configuration task is necessary for VoiceView Express?

Which pre-configuration task is necessary for VoiceView Express?

A.
Ensure that all phones that are owned by the JTAPI user point to the authentication server URL on Cisco Unity Express

B.
Ensure that the authentication server RUL points to Cisco Unity Express

C.
Ensure that all phones point to the authentication server URL owned by Cisco Unity Express

D.
Ensure that authentication server is owned by the JTAPI user on Cisco Unity Express