Which of the following descriptions about Libvirt components is wrong?

Which of the following descriptions about Libvirt components is wrong?
A . Both KVM and Xen can call the api provided by Libvirt to manage the virtualization platform
B. Libvirt is a set of library functions that are called by other technologies to manage the virtual machine on the machine
C. Libvirt provides programming interfaces in multiple languages. You can directly call the external interface provided by Libvirt to operate the virtual machine through programming.
D. Libvirt is a closed source project, it is a very powerful management tool

Answer: D