CompTIA Server+

Answer - C - Server clustering in Windows Server 2008 supports a maximum of 16 nodes.

Key Takeaway: A server cluster is a group of independent servers working together as a single system to provide a high availability of services for clients. When one or some of the servers fail, resources are redirected and the workload is redistributed to the working servers in the cluster. Clustering is used for applications that have long-running in-memory state or frequently updated data. The individual servers in a cluster are called nodes. The maximum number of nodes varies depending on the version of the operating system. For example, Windows Server 2003 supports a maximum of 8 nodes, whereas the newer Windows Server 2008 supports up to 16 nodes.