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 subscriptio