The root element of an XHTML document must be html, and

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The root element of an XHTML document must be html, and must contain an __________ attribute to associate it with the XHTML namespace.

1. link
2. xmlns
3. source
4. src
5. None of these

Correct Option: B

The xmlns attribute specifies the xml namespace for a document. It is manadatory in XHTML while in HTML5 it is optional. The root element of an XHTML document must be html, and must contain an xmlns atrribute to associate it with the XHTML namespace.