题目内容

程序段char a1=’ m’,a2=’ M’;printf(“%c\n”,(a1,a2));以下叙述中正确的是（）。

A. 程序输出小写字母M
B. 格式说明符不足，编译出错
C. 程序运行时产生出错信息
D. 程序输出大写字母m

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