Which statement best describes the benefits of Cisco Integrated Services Routers？（）

A. In a single device，ISRs provide threat defense against attacks from hackers and viruses thatcan occur in the network.
B. In a single device，ISRs provide the framework to integrate and extend wired and wirelessnetworks.
C. In a single device ISRs provide concurrent security， voice， data， wireless and applicationoptimization services.
D. In a single device，ISRs provide the common fabric，functionality，and CLI across the network.