The correct answer is: A. xml
RSS (Really Simple Syndication) is a web feed format used to publish frequently updated content such as blog entries, news headlines, audio, and video. An RSS document (often called a “feed”) contains a list of items, each of which typically includes a title, a link, and a description.
XML (Extensible Markup Language) is a markup language that is used to create documents that can be read by both humans and machines. XML is a very flexible language, and it can be used to create a wide variety of documents, including RSS feeds.
SMIL (Synchronized Multimedia Integration Language) is a markup language that is used to create multimedia presentations. SMIL can be used to create presentations that include text, images, audio, and video.
JSON (JavaScript Object Notation) is a lightweight data-interchange format. JSON is easy to read and write, and it is supported by many programming languages.
Of the options listed, only XML is used by RSS modules.