Which of the following descriptions of the SmartQos feature of Huawei hybrid flash storage is wrong?

Which of the following descriptions of the SmartQos feature of Huawei hybrid flash storage is wrong?
A . The system will schedule I/O requests of different priorities according to the weights of LUNs of different priorities, giving priority to cache allocation requests of higher priority services.
B . When the disk usage is too high, in order to ensure the reliability of the disk, the system will add delay to the low priority I/O to control it, while trying not to affect the high priority I/O
C . When concurrent resources are insufficient, high-priority I/Os will be accepted first and low-priority I/Os will be rejected to ensure that high-priority services get more concurrent data.
D . When a CPU resource bottleneck occurs, low-priority services can use CPU resources only after high-priority services are completed.

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Answer: C