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Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers_（）__through a real-time communication network such as the Internet.In science,cloud computing is a_（）__for distributed computing over a network,and means the_（）_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_（请作答此空）__for building the platform layer of the cloud.In turn,the platform layer is foundation for implementing the_（）__layer for SaaS application.

A.foundation
B.hardware
C.software
D.network

正确答案及解析

正确答案

解析

表示硬件的意思。

附（参考翻译）：云计算是一个用来描述各种计算概念的一个短语，计算概念涉及大量的计算机通过实时通信的网络，如Internet，连接在一起。在科学研究中，云计算是分布式网络计算的同义词，意味着有能力同时在多台互连的计算机上运行一个程序或应用。云的结构分为3层：基础设施、平台和应用。基础实施层由虚拟计算机存储和网络资源构成；平台层是具有通用性和复用性的软件资源的集合；应用层是云上针对SaaS应用的所有应用软件的集合。基础设施层时建立平台层的硬件基础；相应地，平台层是执行应用层SaaS应用的基础。