An IP phone connects a user to a switch as shown below： Based on the diagram shown above， which statement is true about the voice traffic coming to theswitch access port that is connected to the IP phone？（）

• A、A PC connected to a switch port via an IP phone is unaware of the presence of the phone
• B、The traffic on the voice VLAN must be tagged with 802.1p encapsulation in order to coexist onthe same LAN segment with a PC
• C、To improve the quality of the voice traffic， no other devices should be attached to the IP phone
• D、The voice VLAN must be configured as a native VLAN on the switch
• E、A PC connected to a switch port via an IP phone must support a trunking encapsulation