计算机系统的层次结构如下图所示，基于硬件之上的软件可分为a、b和c三个层次。图中a、b和c分别表示（ ）。
- A.操作系统、系统软件和应用软件
- B.操作系统、应用软件和系统软件
- C.应用软件、系统软件和操作系统
- D.应用软件、操作系统和系统软件
正确答案及解析
正确答案
解析
系统软件开发人员开发操作系统和系统软件。应用软件开发人员开发应用软件。
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