下列（ ）属于电子商务的系统架构中电子商务应用层的内容。
- A.网上购物
- B.EDI
- C.网络银行
- D.目录服务
正确答案及解析
正确答案
解析
本题考查电子商务系统架构知识。
电子商务系统四个层次分别是：网络基础设施、多媒体内容和网络出版的基础设施、报文和信息传播的基础设施、商业服务的基础设施。
电子商务应用层在最上层，主要内容包括在线营销与广告、在线购物、采购和购买、远程金融服务、供应链管理、其他应用等。
EDI属于报文和信息传播的基础设施、网络银行和目录服务属于商业服务的基础设施。综上所述，本题选A。
电子商务应用层是电子商务系统的核心部分，是开发过程中主要编写的应用程序。
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