Your company has two branch offices that connect by using a WAN link. Each office contains a server that runs Windows Server 2008 R2 and that functions as a file server.   Users in each office store data on the local file server. Users have access to data from the other office.   You need to plan a data access solution that meets the following requirements： èFolders that are stored on the file servers must be available to users in both offices. èNetwork bandwidth usage between offices must be minimized.   èUsers must be able to access all files in the event that a WAN link fails. What should you include in your  plan？（）

• A、On both servers， implement DFS Replication.
• B、On both servers， install and configure File Server Resource Manager （FSRM） and File Replication  service （FRS）.
• C、On one server， install and configure File Server Resource Manager （FSRM）. On the other server，install and configure File Replication Service （FRS）.
• D、On one server， install and configure Distributed File System （DFS）. On the other server， install and configure the Background Intelligent Transfer Service （BITS）.