Which of the following description about Huawei RAID 2.0+ technology is correct?

Which of the following description about Huawei RAID 2.0+ technology is correct?
A . Each storage layer hard drive type in the hard disk domain is the same
B . hard disk space is divided into fixed-size pieces
C . Users can respectively set "RAID policy" for each of the storage layer in the storage pool
D . grain as the smallest particle of data migration and basic units of ThickLUN composition

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Answer: ABC