单项选择题

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 "AAA"
End If
End Sub
Private Sub Form MouseUp (Button As Integer，Shift As Integer，_
x As Single，Y As Single)
Print "BBB"
End Sub
程序运行后，如果单击鼠标右键，则输出结果为 ______。