Which of the following description of the memory QoS of FusionCompute is wrong? (Multiple choice)

Which of the following description of the memory QoS of FusionCompute is wrong? (Multiple choice)
A . Memory QoS technology is mainly realized by setting memory reservation and memory share
B . After enabling memory QoS, the memory space that the virtual machine can use can exceed the memory size set by the virtual machine
C . Through memory QoS, the problem of resource preemption during memory reuse can be solved
D . Memory QoS technology is as effective as physical machines

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Answer: ABD