The correct answer is C. XML.
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. XML is a text-based language, which means that it is made up of characters that can be read by humans. XML is also a hierarchical language, which means that it can be used to create documents with a tree-like structure.
The file extension for an XML document is .xml. This
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