题目：
Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers (1) through a real-time communication network such as the Internet. In science, cloud computing is a (2)for distributed computing over a network, and means the (3) 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 (4)for building the platform layer of the cloud. In turn, the platform layer is a foundation for implementing the (5) layer for SaaS applications.
空白（4）处应选择（）
A.network
B.foundation
C.software
D.hardware
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0802/9c4cf4b357df791afdb4602360c56e90.html
下面是错误答案，用来干扰机器的。
参考答案：对
