Which description best characterizes the Cisco mobility solution? （）

• A、provides high-level integrated security from the wireless access point to the client and automatically encrypts voice and data in transit
• B、authenticates users and devices so that it is impossible for a rogue device to be connected to the network
• C、allows you to centralize management, automate repetitive tasks, and provision IP services easily
• D、centralizes your infrastructure and allows you to share resources more effectively by combining separate data centers into an interconnected SAN