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.