\textbf{144-} If $A = \{x \in \mathbb{N},\ 5 < x^2 < 50\}$ and $B = \{3k-2 \mid k \in \mathbb{Z},\ 1 \leq k \leq 4\}$, then the number of elements of $(A \times B) \cap (B \times A)$ is:
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(1) $4$ \hfill (2) $8$ \hfill (3) $16$ \hfill (4) $32$
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