Which of the following descriptions about CPU resource QoS and memory resource QoS is incorrect?

Which of the following descriptions about CPU resource QoS and memory resource QoS is incorrect?
A . CPU share and CPU reservation only play a role when each virtual machine competes for computing resources
B. Memory resource QoS is used to ensure that business-critical virtual machines can get enough memory resources
C. The CPU QOS of the virtual machine is used to ensure that the computing resources of the virtual machine are allocated reasonably
D. The memory resource QoS can only be used after the memory multiplexing switch is turned on

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Answer: D