But in the exam, is the correct answer really "<%=3*4%>"?
It depends on the context of the question.
If the body-content of the tld is tagdependent the body <%=3*4%> is given to the tag handler code and it depends on that code if it outputs the body. If the tag handler code is not given in the question then the correct answer is that the body is not writen to the page. (by default it is not output)