在以下事件过程中，可以在用户按下鼠标右键时，显示一个上边框，以鼠标当前位置为中心的弹出式菜单，而且这个弹出式菜单还可以识别右键对菜单命令的选择，相应的选项是（ ）。

A．Private Sub Form_MouseUp（Button As Integer, Shift As Integer, _

X As Single, Y As Single）

If Button=2 Then

PopupMenu mnuEdit, vbPopupMenuCenterAlign Or _

vbPopupMenuRightButton, X, Y, mnuEditOpen

E．nd If

E．nd Sub

B．Private Sub Form_MouseUp（Button As Integer, Shift As Integer, _

X As Single, Y As Single）

If Button=2 Then

PopupMenu mnuEdit,

E．nd If

E．nd Sub

C．Private Sub Form_MouseUp（Button As Integer, Shift As Integer, _

X As Single, Y As Single）

PopupMenu mnuEdit, vbPopupMenuCenterAlign Or _

vbPopupMenuRightButton

E．nd Sub

D．Private Sub Form_MouseUp（Button As Integer , _

Shift As Integer, X As Single, Y As Single）

If Button=2 Then

PopupMenu mnuEdit, 2

E．nd If

E．nd Sub