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The number of product terms in the minimized sum-of-product expression obtained through the following $\text{K}$-map is (where, " $d$ " denotes don't care states)

$$\begin{array}{|c|c|c|c|} \hline 1 & 0 & 0 & 1 \\ \hline 0 & d & 0 & 0 \\ \hline 0 & 0 & d & 1 \\ \hline 1 & 0 & 0 & 1 \\ \hline \end{array}$$

  1. $2$
  2. $3$
  3. $4$
  4. $5$

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