Which of the following descriptions about the development of cloud computing architecture is wrong?

Which of the following descriptions about the development of cloud computing architecture is wrong?
A . The resource pool is constructed from a small-scale resource virtualization integration to a larger-scale resource pool
B . Platform and cloud management software move from closed source and closed source to open source and open source
C . From IT non-critical applications to enterprise critical applications
D . Data form unstructured and semi-structured to structured

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Answer: D