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Of the four networks, $\mathrm{N}_{1}, \mathrm{~N}_{2}, \mathrm{~N}_{3}$ and $\mathrm{N}_{4}$ of the given figure, the networks having identical driving point functions are

1. $\mathrm{N}_{1}$ and $\mathrm{N}_{1}$
2. $\mathrm{N}_{2}$ and $\mathrm{N}_{4}$
3. $\mathrm{N}_{1}$ and $\mathrm{N}_{3}$
4. $\mathrm{N}_{1}$ and $\mathrm{N}_{4}$