Which term describes the use of software to create and manage virtual instances of computing resources on a single physical host?

• A. Virtualization
• B. Vmware
• C. Virtual Server
• D. Warm Site

Answer: (A)

The concept described is virtualization: using software to create and manage virtual instances of computing resources on a single physical host. A hypervisor or virtualization platform sits between the hardware and operating systems, abstracting CPU, memory, storage, and network resources so multiple virtual machines can run concurrently on one machine, each isolated from the others. This enables flexible provisioning, efficient hardware utilization, and easier management of multiple environments.

This fits best because it captures the idea of a software layer that creates separate virtual computers on one physical host. The other terms refer to specific product names or, in the case of a warm site, a disaster recovery setup rather than the general method of running multiple virtual instances on one host.