Which of the following description about cloud computing is correct?

Which of the following description about cloud computing is correct?
A . Cloud computing is a technology that can obtain the IT resources anytime, anywhere, convenient and on demand.
B . Various IT resources in cloud computing need to be paid for use
C . IT resources acquired in cloud computing need to be available through the network
D . In the process of acquiring IT resources, users need to negotiate with cloud computing service providers repeatedly.

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Answer: A