Which of the following is wrong about RAID10?

Which of the following is wrong about RAID10?
A . The first level is a RAID1 mirror pair, and the second level is RAID0.
B . The hard disk utilization rate of RAID10 is 50%
C . RAID10 is a RAID level that combines mirroring and striping.
D . The read and write performance of RAID10 is consistent

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Answer: D