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A.@ command([back]) B.@ command([fileexit]) C.@ command……

kristin wants to build an action which exits the video form. the action will be avaiable only when the user is reading the document ,which one of the following accomplish this ? ()

A.@ command([back])    
B.@ command([fileexit])   
C.@ command([gotoview])     
D.@ command([fileclosewindow])

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