Which of the following methods can be used to determine whether the SSD device has reached the bottleneck? (Multiple choice)

Which of the following methods can be used to determine whether the SSD device has reached the bottleneck? (Multiple choice)
A . Check the performance of the current SSD device, whether it has reached the officially released performance value.
B . Use iostat to check the SSD device parameters, whether the svctm value is significantly higher.
C . For the SSD, you can also check if the %util value has reached 100%^
D . The client reads the data significantly slower

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Answer: ABC