You have a portable computer and a desktop computer that both run Windows XP Professional. Both computers are members of a domain named Contoso. The desktop computer hosts a shared folder named Share1. You need to ensure that all files in the Share1 folder are automatically available on the portable computer when the computer is disconnected from the network.  Which two actions should you perform?（）

• A、From the portable computer, enable offline files. 
• B、From the portable computer, modify the properties of the Shared Documents folder.
• C、From the desktop computer, enable simple file sharing.
• D、From the desktop computer, modify the properties of Share1.