Final answer:
The protocol that allows a website to list information in an XML file is sitemaps. Sitemaps are the protocol that allows a website to list information in an XML file. The correct answer is a) sitemaps. Sitemaps are XML files that contain a list of a web site's URLs and other metadata. They are used by search engines to crawl and index the web site's pages.
Step-by-step explanation:
The protocol that lets a website list information in an XML file is a) sitemaps. Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling. A sitemap is essentially an XML file that lists URLs for a site along with additional metadata about each URL (when it was last updated, how often it changes, and how important it is, relative to other URLs in the site) so that search engines can more intelligently crawl the site.
Sitemaps are XML files that contain a list of a web site's URLs and other metadata. They are used by search engines to crawl and index the web site's pages.