Which of the following is NOT a KVM management tool?

The correct choice indicates that QEMU is not a management tool for KVM in the context meant by the question. In reality, QEMU is a hardware virtualization component that works directly with KVM (Kernel-based Virtual Machine) to provide virtualization capabilities. It emulates hardware to enable KVM to run virtual machines.

In contrast, Virsh, Virt-Manager, and Libvirt are all management tools specifically designed to facilitate the management of KVM virtual machines. Virsh is a command-line interface that allows users to manage virtual machines, while Virt-Manager provides a graphical interface for performing the same tasks. Libvirt is a toolkit that provides a way to manage platform virtualization, including KVM, and contains the APIs used by both Virsh and Virt-Manager.

Thus, while QEMU is essential for the operation of KVM, it serves a different purpose compared to the management focus of the other listed tools.