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I I am confused how it can be Hypervisor
The key point on this Question is OS installation that contained entirely within other OS. The Answer is Guest
Host vs. Guest The foundation of virtualization is the host device, which may be a workstation or a server. This device is the physical machine that contains the software that makes virtualization possible and the containers, or virtual machines, for the guest operating systems. The host provides the underlying hardware and computing resources, such as processing power, memory, disk, and network I/O, to the VMs. Each guest is a completely separate and independent instance of an operating system and application software. The host is responsible for allocating compute resources to each of the VMs as specified by the configuration. The software that manages all of this is called the hypervisor. Based on parameters set by the administrator, the hypervisor may take various actions to maintain the performance of each guest as specified by the administrator