Which of the following cloud computing concepts is used to describe online providers that serve multiple clients with scalable services, such as access to a large number of CPUs and memory from multiple resources?

Which of the following cloud computing concepts is used to describe online providers that serve multiple clients with scalable services, such as access to a large number of CPUs and memory from multiple resources?
A . Rapid elasticity
B . Measured service
C . Cloud file-storage service
D . Resource pooling

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Answer: D