Which of the following statement about RAID50 is correct?
A . RAID50 is extremely reliable and can tolerate up to 4 hard drive failures
B . RAID50 hard disk utilization rate is (N-M)/N (N is the number of RAID member disks; M is the number of RAID subgroups)
C . RAID50 read and write performance is consistent
D . RAID50 is a RAID level that combines RAID5 and RAID0 two levels. Do RAID0 first, then RAID5
Answer: B