You need to recommend a Windows Server 2008 R2 server configuration that meets the following  requirements：   èSupports the installation of Microsoft SQL Server 2008   èProvides redundancy for SQL services if a single server fails What should you recommend？（） 

• A、Install a Server Core installation of Windows Server 2008 R2 Enterprise on two servers. Configure the servers in a failover cluster.
• B、Install a full installation of Windows Server 2008 R2 Standard on two servers. Configure Network Load Balancing on the two servers.
• C、Install a full installation of Windows Server 2008 R2 Enterprise on two servers. Configure Network Load Balancing on the two servers.
• D、Install a full installation of Windows Server 2008 R2 Enterprise on two servers. Configure the servers in a failover cluster.