The figure below shows a multiplexer where $S_{1}$ and $S{2}$ are the select lines, $I_{0}$ to $I_{3}$ are the input data lines, $\text{EN}$ is the enable line, and $\text{F(P, Q, R)}$ is the output. $\text{F}$ is

1. $PQ+\overline{Q}R.$
2. $PQ+Q\overline{R}.$
3. $P\overline{Q}R+\overline{P}Q.$
4. $\overline{Q}+PR.$
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