Which of the following descriptions about RAID is wrong?

Which of the following descriptions about RAID is wrong?
A . RAID 6 ensures the reliability of user data by mirroring
B . RAID 5 ensures the reliability of user data by means of parity
C . RAID 0 improves storage read and write performance through striping
D . RAID 1 ensures the reliability of user data by mirroring

Answer: A

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