Which of the following is an example of open-source virtualization technology?

KVM, which stands for Kernel-based Virtual Machine, is indeed an example of open-source virtualization technology. It is integrated into the Linux kernel, allowing the kernel to function as a hypervisor. This integration means that KVM can take full advantage of the features and stability of the Linux operating system, enabling efficient management of virtual machines.

KVM turns the Linux kernel into a type-1 (bare-metal) hypervisor, supporting multiple guests operating systems running in isolation. Since it is open-source, users can access and modify the source code, contributing to its continual improvement and flexibility. This stands in contrast to proprietary virtualization solutions, which do not provide the same level of accessibility or community-driven enhancement.

In contrast, the other options—FusionCompute, vSphere, and Hyper-V—are proprietary technologies developed by specific companies. FusionCompute is developed by Huawei, vSphere by VMware, and Hyper-V by Microsoft, and these platforms are not open-source. They often come with licensing fees and restrict users from modifying the source code. Therefore, KVM stands out as the only open-source option available in the provided choices.