Which of the following understandings about RAID10 is wrong?

Which of the following understandings about RAID10 is wrong?
A . The first level is a RAID 1 mirror pair, and the second level is RAID 0
B . RAID10 hard disk utilization is 50%
C . RAID10 is a RAID level that combines mirroring and striping
D . RAID10 has consistent read and write performance

Answer: D

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