Case-based Critical Thinking QuestionsCase 12-1Casey is using XML to store information about the students in the science classes that he teaches. He wants to design a DTD that he can use to validate the XML documents that he uses for this purpose, and he comes to you for help. After you teach Casey about declarations for elements with child elements, he constructs the element declaration . Given this declaration, which of the following is NOT a valid "class" element?
A.
B.
C.
D.
Answer: C
Computer Science & Information Technology
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