What is a key characteristic of the Cisco Business Ready Teleworker solution which is different from traditional software-client based Teleworker solutions?（）

• A、all traffic is encrypted using IPSec and the Triple-DES algorithm
• B、full support for all Enterprise applications, including data, voice, and video
• C、thousands of Teleworker VPN tunnels can be aggregated to a headquarters location
• D、the VPN tunnel is an always on site-to-site VPN connection
• E、portability for use while traveling
• F、used with broadband Cable/DSL subscriptions