单项选择题
您正在Certkiller-WS554开发.NET Framework 2.0 Windows 窗体应用程序。Windows 窗体应用程序供各国 Certkiller.com 的区域办事处使用。您需要自定义应用程序，以便基于用户的操作系统设置更改语言、 日历和文化的约定。另外需要确定应该用于这一要求的.Net Framework类。你应该做什么？（）
A.应使用CultureInfo类
B.应使用TextInfo类
C.应使用DateTimeFormtaInfo
D.应使用CharUnicodeInfo
E.应使用RegionInfo
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