问题：

[单选] You are a network administrator of a large investor relations company that uses a switchednetwork to carry both data and IP telephony services. Why should you carry voice traffic on aseparate VLAN？（）

A . IP phones require inline power and must be in separate VLAN to receive inline power
B . IP telephony applications require prioritization over other traffic as they are more delaysensitive
C . IP phones can only receive IP addresses through DHCP if they are in separate VLAN
D . The CDP frames from the IP phone can only be recognized by the switch if the phone is in anauxiliary vla