The following figure shows dependence of molar conductance of two electrolytes on concentration. ${\mathrm{\Lambda }}_{\mathrm{m}}^0$ is the limiting molar conductivity. Choose the correct statement(s).

 ${\lambda }_M^0$  For electrolyte A is obtained by extrapolation 

${\lambda }_M^0$ For electrolyte A is obtained by Kohlrausch law

${\lambda }_M^0$ For any electrolyte A and B cannot be calculated by extrapolation

${\lambda }_M^0$ For electrolyte B, is obtained by extrapolation