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.