When protecting VMs, whore is the Veeam CBT driver (file system filter driver) installed?

When protecting VMs, whore is the Veeam CBT driver (file system filter driver) installed?
A. On every managed Hyper-V 2012 R2 or older host
B. On every managed Veearn backup proxy
C. On every managed server
D. On every managed VMware vSphere ESXi 5.1 or older host
E. On every managed Hyper-V 2016 or newer host

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