I’m tryng for my certification and learning a ton but have not been able to find the answer to this question. I am leaning towards it being a trick question and all the choices of routers could have a virtual machine installed on them. My choices are; “BR1 series, HD2 series, HD4 series, Balance series (greater than 305, Peplink Mediafast”. I have seen forum posts about VPN on BR1, HD4 and on Mediafast, but not able to see VM compatibility on product comparisons to confirm the others are incompatible.
Its not a trick question.
Some routers support KVM Virtualization. SDX Pro mentions this in its data sheet
There is also a guide on here explaining how to install a virtual machine
https://forum.peplink.com/t/how-to-install-a-virtual-machine-on-peplinkpepwave-mediafastcontenthub-routers/615d563606128ac0b42e68b7/
The bottom paragraph of the last link has your answer 
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Thank you!
Hi Russell,
in addition to wha Martin mentioned, the virtualisation will be added to a newly released Transit Pro as well.
Cool! Application virtualisation in the form of Docker though right - not KVM virtualisation…?
Yes, correct. Docker will be supported, while KVM as I know preliminary will not be supported