To answer this question, you need to have a basic understanding of XML (eXtensible Markup Language). Let's go through each option to understand why it is correct or incorrect:

Option A) All the statements are true - This option is incorrect because not all statements can be true simultaneously. We need to evaluate each statement individually.

Option B) All XML elements must have a closing tag - This option is correct. In XML, each element must have a closing tag, except for empty elements, which are self-closing.

Option C) All XML elements must be lowercase - This option is incorrect. XML is case-sensitive, so element names can be in uppercase, lowercase, or a mixture of both.

Option D) All XML documents must have a DTD - This option is incorrect. XML documents do not necessarily require a Document Type Definition (DTD). A DTD is an optional component used to define the structure and rules of an XML document, but it is not mandatory.

The correct answer is B) All XML elements must have a closing tag. This option is correct because it aligns with the basic syntax and rules of XML.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) It contains a root element - This option is incorrect because an XML document must have a root element, but it can also have additional elements.

Option B) It contains an element - This option is correct because an XML document must contain at least one element. The element serves as the building block for the XML structure.

Option C) It contains one or more elements - This option is partially correct. An XML document can contain one or more elements, so this statement is true. However, it is not the only requirement for a well-formed XML document.

Option D) Must contain one or more elements and the root element must contain all other elements - This option is incorrect. While an XML document must contain one or more elements, the root element does not necessarily have to contain all other elements. Elements can be nested within other elements to create a hierarchical structure.

The correct answer is B) It contains an element. This option is correct because an XML document must contain at least one element to be considered well-formed.

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• Wrong explanation