The correct answer is: A. sitemaps
A sitemap is a list of all the pages on a website. It is used by search engines to index the website and improve its ranking in search results. Sitemaps can be created in XML or HTML format.
A mashup is a web page or application that combines content from multiple sources. Mashups are often used to create new and innovative ways to view and interact with data.
A hashup is a type of mashup that uses data from social media platforms. Hashups are often used to create real-time updates or to track trends.
Sitemaps are the only option that allows a website to list information in an XML file.