A . A、mdadm--create/dev/md0--level=5--raid-devices=3/dev/sda2/dev/sdb2/dev/sdc2
B . B、mdadm--create/dev/md1--level=5--raid-devices=3/dev/sda2/dev/sdb2/dev/sdc2
C . C、mdadm--create/dev/md0--level=5--raid-devices=3/dev/sda2/dev/sdb2/dev/sdc2
D . D、mdadm--create/dev/md1--level=5--raid-devices=2/dev/sda2/dev/sdb2/dev/sdc2
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