answer
correct answer is C. Extensible Markup Language
reason:
it is a markup language used for encoding documents in a format that is both human-readable and machine-readable. it is designed to store and transport data, and it allows users to create their own customized tags, making it highly flexible and versatile. it is widely used for data exchange between different systems, such as web services, and for data storage and retrieval. Its popularity lies in its ability to support a wide range of applications, from simple text documents to complex scientific and financial data.