Final answer:
The scalability limit of Hyper-V in Windows Server 2012 is 64 virtual processors per VM, which is crucial for virtualized environments that demand significant processing power.
Step-by-step explanation:
The correct scalability limit of Hyper-V on Windows Server 2012 is 64 virtual processors per VM. This means that each virtual machine (VM) running on Hyper-V can be allocated up to 64 virtual CPUs. This scalability limit is an important consideration for organizations that require high levels of processing power for their virtualized environments.