jasonsaulnier on "[Plugin: W3 Total Cache] 404 error exception list:"

In this section what do I add in this? Which ones should work well. I use google xml sitemap plugin.
404 error exception list:
robots\.txt
sitemap\.xml(\.gz)?
sitemap(_index)?\.xml(\.gz)?
(sitemapindex|[a-z0-9_-]+)\.xml

http://wordpress.org/extend/plugins/w3-total-cache/