Limiting molar ionic conductivities (in $\mathrm{S}\mathrm{c}{\mathrm{m}}^2\mathrm{mo}{\mathrm{l}}^{-1}$): $\mathrm{K}{}^{+}=73.5$, $\mathrm{Na}{}^{+}=50.1$, $\mathrm{Ag}{}^{+}=61.9$, $\mathrm{Cl}{}^{-}=76.3$, $\mathrm{NO}{}_3{}^{-}=71.4$. Which of the following statement(s) is/are correct?

1. A${\Lambda }_m^{\circ }(\mathrm{KCl})=149.8\mathrm{S}\mathrm{c}{\mathrm{m}}^2\mathrm{mo}{\mathrm{l}}^{-1}$
2. B${\Lambda }_m^{\circ }(\mathrm{AgNO}{}_3)=133.3\mathrm{S}\mathrm{c}{\mathrm{m}}^2\mathrm{mo}{\mathrm{l}}^{-1}$
3. C${\Lambda }_m^{\circ }(\mathrm{AgCl})$ can be obtained as ${\Lambda }_m^{\circ }(\mathrm{AgNO}{}_3)+{\Lambda }_m^{\circ }(\mathrm{KCl})-{\Lambda }_m^{\circ }(\mathrm{KNO}{}_3)$ and equals $138.2\mathrm{S}\mathrm{c}{\mathrm{m}}^2\mathrm{mo}{\mathrm{l}}^{-1}$
4. D${\Lambda }_m^{\circ }(\mathrm{NaNO}{}_3)$ is greater than ${\Lambda }_m^{\circ }(\mathrm{KCl})$