Which of the following simplification statements can be applied to Prolog pairs? Select all that apply.  Omit the vertical bar and the brackets when the item to the right of the vertical bar is an empty list.
 Omit the vertical bar and the brackets when the item to the right of the vertical bar is a pair.  Omit the vertical bar when the item to the right of the vertical bar is a pair.  Omit the brackets if they represent the empty list.