A technician is tasked with creating servers that are fault tolerant and highly available. Which of the following would be the BEST solution for this task?

Load balancing distributes incoming requests across multiple servers but does not inherently provide automatic failover or fault tolerance unless explicitly paired with health-check and failover mechanisms.

Virtualization allows multiple virtual machines to run on a single physical host but does not by itself protect against hardware failure of that host or provide automatic failover between physical servers.

A server cluster groups two or more physical servers so that if one node fails, its workloads are automatically transferred to another active node with minimal or no downtime. This architecture inherently provides fault tolerance by eliminating single points of failure and high availability by keeping services continuously accessible. No other option listed combines both of these properties by default at the server infrastructure level.

Round robin is a simple request-distribution method used in DNS or load balancers that rotates traffic across servers but provides no automatic failover or fault tolerance when a server fails.