Question: XML provides a framework for specifying markup languages, while HTML is a predefined markup language. What is applicable to XML and not HTML?

1. It is mandatory to use closing tags with XML
2. It is important for an XML document to be well formed
3. XML elements start with an opening tag in angle brackets, such as `

   `

4. XML syntax uses tags, elements, and attributes

Answer: The correct answer of the above question is Option A:It is mandatory to use closing tags with XML