What is a VHD and its role in Hyper-V?

• A. VHD is a hardware driver.
• B. VHD is the virtualization host.
• C. VHD is the virtual hard disk file used by Hyper-V to store a VM's data.
• D. VHD is a virtual network switch.

Answer: (C)

A VHD is the virtual hard disk that stores everything inside a Hyper-V virtual machine. When you create a VM, Hyper-V attaches a VHD (or VHDX in newer setups) file that acts like the VM’s actual hard drive. The operating system boots from this virtual disk, and all program files, data, and system files live inside it. From the VM’s perspective, it’s just a hard drive, but on the host it’s a file you can manage, back up, move, or resize. VHDs can be fixed in size or grow dynamically as data is written, and VHDX adds improvements like larger sizes and better resilience. This is distinct from a hardware driver (which enables hardware communication), the virtualization host (the Hyper-V server itself), or a virtual network switch (which handles networking). So the VHD’s role is simply to provide the VM’s persistent storage in a disk image.