Explanation: A hypervisor is a virtualization technique that allows multiple operating systems (guests) to run concurrently on a host computer. It is also called the virtual machine monitor (VMM). The hypervisor provides a virtual operating platform to the guest operating systems and checks their execution process. It provides isolation to the host’s resources. The hypervisor is installed on server hardware. Answer: A is incorrect. Emulator duplicates the functions of one system using a different system, so that the second system behaves like the first system. Answer: D is incorrect. CP/CMS is a time-sharing operating system of the late 60s and early 70s, and it is known for its excellent performance and advanced features. Answer: C is incorrect. Grid computing refers to the combination of computer resources from multiple administrative domains to achieve a common goal.