Which of the following is an IS auditor's BEST recommendation to help an organization increase the efficiency of computing resources?

Hardware upgrades improve performance but do not inherently increase the efficiency of existing resources; they add more, potentially underutilized, capacity.

Real-time backups are critical for data protection and recovery, but they do not directly increase the efficiency of computing resources in terms of processing power or utilization.

Virtualization is the best recommendation because it allows multiple operating systems and applications to run concurrently on a single physical server, significantly increasing the utilization of underlying hardware resources like CPU, memory, and storage. This consolidates workloads, reduces the number of physical servers, and thereby enhances overall computing efficiency and often reduces power consumption.

Overclocking the CPU increases processing speed beyond manufacturer specifications, but it reduces system stability, increases power consumption and heat, and shortens hardware lifespan, making it an inefficient and risky practice rather than a best recommendation.