Molar ionic conductivities of divalent cation and anion are $57 \mathrm{~S~cm}^2 \mathrm{~mol}^{-1}$ and $73 \mathrm{~S~cm}^2 \mathrm{~mol}^{-1}$ respectively. The molar conductivity of solution of an electrolyte with the above cation and anion will be:

1. A $187 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$
2. B $260 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$
3. C $65 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$
4. D $130 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ Correct answer