a) <output>
b) <keygen>
c) <datalist>
d) <data>
Answer: a
Explanation: The output tag represents the result of a calculation (like one performed by a script). <keygen> has been removed from HTML5 and it specifies a name to <keygen> element which refers to data after it’s submission. <datalist> is a list of pre-defined option for input element. The additional details the user wants to know as per the demand is fulfilled by <details> tag.
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