Which of the following statements about RAID50 is correct?

Which of the following statements about RAID50 is correct?
A . RAID50 has a very high reliability and can tolerate up to 4 hard disk failures
B . The hard disk utilization rate of RAID50 is (N-MI)/N (N is the number of RAID member disks, M is the number of RAID subgroups)
C . RAID50 has consistent read and write performance
D . RAID50 is a RAID level that combines RAID5 and RAID0. First do RAID0, then do RAID5

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Answer: B