Hmm, I'm not sure about that. Shouldn't the 'contact' element have at least one 'TEL' or 'FAX' element? Option D might be valid, as it could represent an empty 'contact' element.
The valid XML documents are A and B. The DTD specifies that the 'contact' element can have either 'TEL' or 'FAX' elements, but not both. Option A and B meet this requirement, while C and D do not.
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