Final answer:
RSS 1.0 belongs to C.RDF and D.XML file types because it is formatted using RDF, which is a subset of XML. HTML and JSON are not related file types for RSS 1.0.
Correct option is D.XML
Step-by-step explanation:
RSS 1.0, or RDF Site Summary, is a format for syndicating web content, commonly used for news updates. It primarily utilizes C.RDF (Resource Description Framework) and D.XML (eXtensible Markup Language). The core structure of RSS 1.0 is based on RDF, a framework for representing metadata about web resources, and XML, a markup language for encoding documents in a format that is both human-readable and machine-readable. The RDF format enables the creation of relationships and metadata, while XML provides a standardized way to structure data. Therefore, choices C (RDF) and D (XML) are accurate file types for RSS 1.0. Conversely, HTML (A) and JSON (B) are not directly associated with RSS 1.0, as RSS primarily relies on RDF and XML for its structure and content description rather than HTML or JSON formats.