对窗体编写如下事件过程： Private Sub Form _MouseDown(Button As Integer, _ Shift As Integer, X As Single Y As Single) If Button =2 Then Print "AAAAA" End If End Sub Private Sub Form _ MouseUp(Button As Integer, _ Shift As Integer, X As Single, Y As Single) Print "BBBBB" End Sub 程序运行后，如果单击鼠标右键，则输出结果为（ ）。
A.AAAAA BBBBB
B.BBBBB AAAAA
C.AAAAA
D.BBBBB
正确答案是A