问题：

[单选] Of the threats discussed below， what is the main advantage of using Cisco Secure Desktop which is part of the Cisco ASA VPN solution？（）

A .  Secure desktop will create a completely separate computing environment thatwill be deleted when you are done.This ensures that no confidential data has been left on the shared/public computer.
B .  Secure desktop is used to protect access to your registry and systemfiles when browsing to SSL/VPN protectedpages.
C .  Secure Desktop ensures that an SSLprotected password cannotbe exploitedby a man in the middle attackusing a spoofed certificate.
D .  Secure desktop hardens the operating system of the machines you are using at the time secure desktop islaunched.