Let $U$ be universal set. If $A$ and $B$ are subsets of $U$, then match the following and choose the correct answer.
{ll}
List - I & List - II
(a) $A \cup A'$ & (i) $A$
(b) $(A \cup B)'$ & (ii) $A' \cup B'$
(c) $(A \cap B)'$ & (iii) $A' \cap B'$
(d) $(A')'$ & (iv) $U$
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