What is the correct description of a Virtual Machine Monitor (VMM)?

A Virtual Machine Monitor (VMM), also known as a hypervisor, plays a crucial role in virtualization technology. It is responsible for managing multiple virtual machines (VMs) that run on a single physical host. The correct description of a VMM is that it runs on the Host OS. This means that the VMM resides above the physical hardware but below the operating systems of the guest VMs, allowing it to allocate resources and manage the various operating systems running on top of it.

By running on the Host OS, the VMM interacts directly with the hardware, facilitating the creation, execution, and management of the virtual machines. It abstracts the physical hardware resources, enabling multiple guest operating systems to operate independently on the same physical machine.

This organization ensures that the guest machines, which each run their own operating systems and applications, can operate simultaneously while sharing the underlying physical resources managed by the VMM. Therefore, describing the VMM as running on the Host OS reflects its essential function in creating a virtualization layer between the physical machine and the guest environments.