[单选题]You need to add a pop-up menu to the CV_EMP canvas

AUse the Layout Editor to create a pop-up menu, assign commands to the menu in the Menu Editor, and attack the menu items to the canvas. 

BUse the Report Wizard to create a pop-up menu and attack the menu items to the canvas.  

CAlter the pop-up Menu Property value in the Property Palette of the canvas. 

DUse the Object Navigator to create a pop-up menu, assign commands to the menu items, and attack the menu to items or canvases.