以下叙述中正确的是( )。
A.Private Sub Form_Mouse Down(Button As Integer,Shift As Integer,- X As Single,Y As Single) If Button=2 Then PopupMenu Bs,2 End Sub
B.Private Sub Form_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Single) PopupMenu Bs End Sub
C.Private Sub FOrm_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Single) PopupMenu Bs,0 End Sub
D.Private Sub Form_MouseDown(Button As Integer,Shin As Integer,- X As Single,Y As Single) If(Button=vbLeftButton)Or(Button=vbRightButton)Then PopupMenu Bs End Sub