Your network contains a Web-based application that runs on Windows Server 2003. You plan to migrate the Web-based application to Windows Server 2008 R2. You need to recommend a server configuration to support the Web-based application. The server configuration must meet the following requirements： èEnsure that the application is available to all users if a single server？fails èSupport the installation of .NET applications èMinimize software costs What should you recommend？（）
A、Install the Server Core installation of Windows Server 2008 R2 Standard on two servers. Configure the servers in a Network Load Balancing cluster.
B、Install the full installation of Windows Server 2008 R2 Web on two servers. Configure the servers in a Network Load Balancing cluster.
C、Install the full installation of Windows Server 2008 R2 Enterprise on two servers. Configure the servers in a failover cluster.
D、Install the full installation of Windows Server 2008 R2 Datacenter on two servers. Configure the servers in a failover cluster.
