The tab of the ribbon allows a user to access the header and the footer command group will be "Insert".
Insert tab
The Insert tab provides a variety of things that users may insert into a document. Choose whether in Header or Footer on the Insert tab, in both Categories.
Select the header, as well as the footer template visitors, wish to employ by clicking it. Whenever a user adds a header as well as a footer, Word inserts a Design context tab beneath the Header & Footer capabilities. These same instructions here on the tab are used to format headers, footers, or maybe both.
Thus "Option C" is appropriate.
Find out more information about the Insert tab here:
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