信息系统开发与应用中使用到的软件按照层次结构划分，数据库管理系统处于（）下层。-问呀课堂

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[单选题]信息系统开发与应用中使用到的软件按照层次结构划分，数据库管理系统处于（）下层。

A通信软件

B操作系统

C应用软件

D网络软件

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