Which of the following will explain why only some of the CPU cycles are available to a virtualized server using two virtualized processors?

Which of the following will explain why only some of the CPU cycles are available to a virtualized server using two virtualized processors?
A . Extra processing is needed to store encryption keys used for secure transmission between the server and the network.
B . Additional processing is used to run ports and services not turned off through the process of server hardening.
C . Some processing is required for operational overhead on the processor and between the physical and virtualized processors.
D . Significant processing is used to create and maintain the cache on multi-core processors.

Answer: C