Which series of wireless LAN controllers delivers WLAN services to small and midsize enterprise environments？（）

A. ISRs provide threat defense against attacks from hackers and viruses that can occur in thenetwork.
B. ISRs provide the framework to integrate and extend wired and wireless networks
C. ISRs provide concurrent security， voice， data， wireless， and application optimization services.
D. ISRS provide the common fabric， functionality， and CLI across the network.

A. customer issue narratives
B. training and events
C. ordering information
D. products and services information

A. improveQos
B. reduced costs for all types of users
C. packet inspection at wire speed
D. reduced complexity