How Does Vagrant Run Virtual Machines

Multiple Choice

How does Vagrant run virtual machines?

A) Vagrant uses a vagrant-specific hypervisor called VagrantVM.
B) Vagrant has to be run within a running virtual machine which is not controlled by Vagrant.
C) Vagrant ships with an embedded version of VirtualBox.
D) Vagrant uses so-called provides which control external hypervisors such as VirtualBox.
E) Vagrant generates virtual machine images but does not provide a mechanism to run them.