When load balancing traffic between two web servers, which of the following technologies provides the LOWEST cost solution?

An active/passive cluster is primarily for high availability and failover, not active load balancing, and involves significant costs for clustering software, shared storage, and configuration.

An active/active cluster, while providing load balancing and high availability, typically requires specialized load balancing hardware or software, and complex setup, incurring higher costs than simple DNS round robin.

Log shipping is a database high-availability and disaster recovery solution, not a technology used for load balancing web server traffic.

DNS round robin is generally the lowest cost solution because it leverages existing DNS infrastructure to distribute incoming requests across multiple servers by cyclically returning different IP addresses from a list. It requires no additional hardware or complex software, making it highly economical.