Hyper-V 2012 Host Cluster - To domain or not domain

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http://serverfault.com – I'm planning on implementing a Hyper-V 2012 cluster, in a host cluster configuration. Should the host machines be in a domain? If so, should that DC machine be a part of the cluster, or a seperate machine? Should the hosts be in the same domain as the guest VMs? (HowTos)