Refer to the exhibit.&

Refer to the exhibit.  Which statement is true when voice traffic is forwarded on the same VLAN  used by the data traffic？ （）

• AThe voice traffic cannot be forwarded to the distribution layer.
• BThe voice traffic cannot use 802.1p priority tagging.
• CPort security cannot be enabled on the switch that is attached to the IP phone.
• DQuality of service cannot be applied for the voice traffic.