A is a software implementation of a computer that executes programs as if it were a real physical computer within the physical memory of the host machine, but completely separated from the underlying hardware of the host machine.

The answer is "Virtual machine ".

Explanation:

The VM stands for Virtual machine, it is a portable device, that operates on the actual hardware framework as a virtual software to its Processor like, ram, network access, and data. It is a project called hypervisor splits the assets of the system from both the hardware and distributes the resources directly.

It runs the program as if the host's internal memory is a true physical device, but is isolated from the host's underlying hardware. It can run an operating system on your desktop in an app window, that functions as a full, separate device.

You need to call the office. and then you need to give them a reason on why you want to change your username.

No because to small needs to be bigger