You have a computer that runs Windows XP Professional. The computer is joined to an Active Directory domain. The domain contains a global group named Group1. You share a folder named Folder1 on the computer. You modify the NTFS permissions on Folder1 to assign Full Control to Group1. Users from Group1 report that they are unable to add files to Folder1 from the network. You need to ensure that members of Group1 can add files to Folder1 from the network. What should you do?（） 

• A、Add Group1 to the Power Users group.
• B、Add Group1 to the HelpServicesGroup.
• C、Modify the share permissions on Folder1.  
• D、Enable simple file sharing and modify the NTFS permissions on Folder1.