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The Boolean function $f$ implemented in the figure using two input multiplexers is

1. $\mathrm{A} \overline{\mathrm{B}} \text{C}+\mathrm{A} \overline{\mathrm{B}} \overline{\mathrm{C}}$
2. $\mathrm{ABC}+\mathrm{A} \overline{\mathrm{B}} \overline{\mathrm{C}}$
3. $\overline{\mathrm{A}} \mathrm{BC}+\overline{\mathrm{A}} \overline{\mathrm{B}} \overline{\mathrm{C}}$
4. $\overline{\mathrm{A}} \overline{\mathrm{B}} \mathrm{C}+\overline{\mathrm{A}} \mathrm{B} \overline{\mathrm{C}}$