Which of the following descriptions about distributed storage is wrong?

Which of the following descriptions about distributed storage is wrong?
A . Distributed storage has no controller enclosure and disk enclosure. All hard disk storage resources come from general servers.
B. The equipment used in distributed storage is generally an ordinary server rather than a storage device
C. Distributed storage has good scalability
D. Distributed storage uses RAID technology to ensure high availability and security of data

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Answer: D