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