What must you insert in a document to format the front matter pages of a long document with Roman numerals?

To format the front matter pages of a long document with Roman numerals, you need to insert a section break. This is because section breaks allow you to apply different formatting to different parts of your document, such as page numbering styles. By inserting a section break, you can have one part of the document, like the front matter, numbered with Roman numerals (i, ii, iii) while the main text might use standard Arabic numerals (1, 2, 3).

Using a section break effectively separates the front matter from the rest of the document, enabling you to customize headers, footers, and page numbering settings independently for each section. This flexibility is essential for maintaining proper formatting in longer documents where different sections often require distinct organizational structures or styles. Other options, like page breaks, would not give you the control needed over numbering formats, while footnotes and headers serve different purposes unrelated to changing page numbering formats for sections.