\textbf{104--} If $A$ and $B$ are two finite sets from the universal set $U$, the set $[(B \cup A) \cap B] \cap (B \cap A)$ is equal to which set? $A' \cup (B \cap A)$
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\hspace{1cm} (1) $(A-B)'$ \hspace{2cm} (2) $B-A$ \hspace{2cm} (3) $B$ \hspace{2cm} (4) $\varnothing$
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