问题：

[单选] Which of these statements regarding Cisco’s WebVPN support is correct？（）

A .  Cisco ISR Routers with the Enhanced Security Bundles support WebVPN.
B .  Cisco security appliances act as a proxy between the end user and the target web server.
C .  Cisco PIX Security Appliances （running release 7.0） and Adaptive Security Appliances both support WebVPN.
D .  Cisco’s WebVPN solution supports both TCP and UDP port forwarding for legacy application support.