What is the main advantage of using hypervisors in virtualization?

Using hypervisors in virtualization primarily provides the advantage of allowing multiple operating systems to run simultaneously on a single physical machine. This is significant because it enables efficient use of hardware resources by maximizing the utilization of the underlying physical server. With a hypervisor, each operating system runs in its own virtual environment, isolated from others, which enhances system stability and flexibility. This setup is particularly useful in scenarios such as testing different OS configurations, deploying applications across various environments, and maximizing resource allocation, all without the need for additional physical machines.

The other options do not accurately represent the primary advantage of hypervisors. While they may relate to virtualization, they do not capture the fundamental purpose of running multiple OS instances efficiently on a single piece of hardware.