A. All XML documents must have DTD
B. All XML elements must have lowercase
C. All XML elements must be closed
D. All the statements are true
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A. All XML documents must have DTD
B. All XML elements must have lowercase
C. All XML elements must be closed
D. All the statements are true
The correct answer: D. All the statements are true.
All XML documents must have DTD: A DTD specifies which tags are allowed in your XML document, how those tags can be structured and named. All documents must have one DTD located at the top.
All XML elements must have lowercase: The first letter of all elements must be lowercase. All XML attributes must have lowercase: The first letter of all attribute names must be lowercase.
All XML elements must be closed: All elements must be closed, i.e., end with /> . XML attributes must be quoted: All attribute values (including element content) must always be within quotes. Single or double quotes are acceptable as long as they match.