The MLA style specifies that a superscript be used for a note reference mark to signal an explanatory note exists either at the bottom of the page as a(n) __________.
- footnote or at the end of the document as a startnote
- headnote or at the end of the document as an endnote
- footnote or at the end of the document as an endnote
- headnote or at the end of the document as a startnote