Server clusters have strong scalability. As demand and load increase, which of the following methods can generally be used to increase the performance of the cluster?

Server clusters have strong scalability. As demand and load increase, which of the following methods can generally be used to increase the performance of the cluster?
A . Increase the networking bandwidth in the cluster
B . Increase the memory capacity of a single server in the cluster
C . Add a new cluster server to the cluster system
D . Replace the hard drive of a single server in the cluster with a high IO solid state drive

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Answer: C