The correct answer is B. XML.
HTML stands for HyperText Markup Language. It is a markup language used to create web pages. HTML is a set of tags that are used to define the structure and content of a web page.
XML stands for Extensible Markup Language. It is a markup language that is used to create self-describing data. XML is a more flexible and powerful markup language than HTML.
XSD stands for XML Schema Definition. It is a language used to define the structure of XML documents. XSD is used to validate XML documents.
XSL stands for Extensible Stylesheet Language. It is a language used to style XML documents. XSL is used to transform XML documents into other formats, such as HTML or PDF.
In conclusion, the correct answer is B. XML. XML is a condensed form of standard generalized markup language.