Which of the following descriptions about Libvirt components is wrong?

Which of the following descriptions about Libvirt components is wrong?
A . Libvit is a set of library functions, called by other techniques, to manage virtual machines on the machine
B . KVM, Xen and LXC, etc., can call the api provided by Libvir to manage the virtualization platform
C . Libvit is a closed source project, it is a very powerful management tool
D . Libvirt provides programming interfaces in multiple languages, which can be directly programmed to call the external interface provided by Libvir to realize the operation of the virtual machine

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Answer: C