When might it improve virtual machine performance to memory taxrate?

The VM kernel assesses a tax on virtual machines ‘idle memory. When might it improve virtual machine performance to memory taxrate?

A.
When virtual machines ‘memory needs are constant andl ow.

B.
When virtual machines’ memory needs are constant and high.

C.
When virtual machines regularly experience bursts of memory consumption.

D.
When virtual machines have mostly idle memory.