Which of the following options are features of RAID5? (Multiple choice)

Which of the following options are features of RAID5? (Multiple choice)
A . Generally speaking, RAID5 requires at least 3 hard drives.
B . The number of hard disks with the same specifications is N, and they are made into a RAID5, then the actual available space is the space of N-1 hard disks.
C . The check data is evenly distributed on all hard drives.
D . Proprietary hard disk saves verification data

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Answer: ABC