问题：

[单选] Which preconfiguration task is necessary for VoiceView Express? （）

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