You are a systems administrator responsible for deploying Windows SharePoint Services （WSS） for accessby users from an external business partner. You have installed the appropriate server role and have verified that the SharePoint Web site loads properly from the local server computer. All options are usingtheir installation default values. External users report that they cannot log on to the site. Which of thefollowing changes should you make to resolve the problem？（）

• A、Create a new site within an existing site collection for the external users.
• B、Create a new site collection for the external users.
• C、Change the authentication mode for the Web application to Forms authentication.
• D、Modify the User Permissions For Web Applications settings.