What is an advantage of server virtualization from a maintenance perspective?

What is an advantage of server virtualization from a maintenance perspective?
A . Hosts can be upgraded or replaced non-disruptively to the virtual machines running on the hosts.
B . Virtual machines can be non-disruptively relocated to more powerful platforms, if required.
C . Virtual machines that are powered on but not being accessed, use no CPU or memory resources.
D . Hosts can be powered off with no effect to the virtual machines running on the hosts.

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Answer: C