(单选题)20: Windows_Form应用程序中,要求下压按钮控件Button1有以下特性:正常情况下,该按钮是扁平的,当鼠标指针移动到它上面时,按钮升高.那么,在程序中,属性Button1.FlatStyle的值应设定为()
A: System.Windows.Forms.FlatStyle.Flat
B: System.Windows.Form.FlatStyle.Popup
C: System.Windows.Forms.FlatStyle.Standard
D: System.Windows.Forms.FlatStyle.System
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