Does it matter which of these I add to my Sitemaps file?
http://example.com/?feed=rss http://example.com/?feed=rss2 http://example.com/?feed=rdf http://example.com/?feed=atom
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No, it doesn't, as long as you are using a supported format. I encourage you to use the rss2 or atom formats.
Moreover, because the feed displays only the latest entries, I suggest you to use a sitemap plugin to list all your pages in the sitemap. The Google XML Sitemaps is a good choice.
None. The sitemap file is for your site's content(pages, media, etc.), not the feeds.
You can actually use a feed-format file as your sitemap, for that matter, so this would just be kind of redundant.