Consider the following XML DOCTYPE declaration. Which of the following sentences correctly describes the meaning of this declaration when it is included in an XML document?

Question

Consider the following XML  DOCTYPE  declaration.

<!DOCTYPE books SYSTEM "books.dtd">

Which of the following sentences correctly describes the meaning of this declaration when it is included in an XML document?

Answer

The XML in the document must conform to the Document Type Definition (DTD) schema defined in an external file named "books.dtd"

Answer

The XML document must contain an inline Document Type Definition (DTD)

Answer

The XML document must contain an inline Document Type Definition (DTD) matching the contents of the "books.dtd" file

Answer

The XML document can define its own elements

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