问题：
[单选题]在Windows中，有些菜单选项的前面有打勾记号，这意味着这些菜单选项______。
A、对应的功能正在起作用
B、对应的功能未起作用
C、提醒用户小心使用
D、提醒用户重点使用
参考答案：
A
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