To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）

A.protection against denial of service （DoS） attacks at infrastructure routers and switches
B. protection against known worm attacks in routers and switches
C.quality of service （QoS） control for packets that are sourced from the data plane of Cisco routers and switches
D.quality of service control （QoS） for packets that are destined to the control plane of Cisco routers and switches
E.quality of service （QoS） control for packets that are destined to the data plane of Cisco routers and switches

A.WLSE supports centralized configuration. 
B.WLSE supports distributed configuration.
C.WLSE can pick up statistics on a device even if the device is not properly configured.
D.WLSE can be used to upgrade the firmware on APs and bridges.
E.WLSE monitors device fault and performance conditions but cannot report any policy misconfigurations

A.H323
B.UDP
C.RTP
D.TCP
E.Media Gateway Control Protocol (MGCP)  
F.session initiation protocol (SIP)