Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number ofcomputers (71) throug

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问题   Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number ofcomputers (71) through a real-time communication network such as the Internet.In science,cloud computing is a (72) for distributed computing over a network, and means the (73) to run a program or application on many connected computers at the same time.
  The architecture of a cloud is developed at three layers:infrastructure,platform,and application.The infrastructure layer is built with virtualized compute,storage,and network resources.The platform layer is for general-purpose and repeated usage of the collection of software resources.The application layer is formed with a collection of all needed software modules for SaaS applications.The infrastructure layer serves as the (74)  forbuilding the platform layer of the cloud.In turn,the platform layer is a foundation for implementing the (75) layer for SaaS applications.
(74)

选项 A、network   
B、foundation
C、software   
D、hardware

答案B

解析
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