If weak monobasic acid is titrated with NaOH, which of the following is correct graph?

In the given options graph 2 is correct.

Initially, the conductance is slowly increases because of the weak ionization of weak monobasic acid. As NaOH (a strong electrolyte) is added, then first, a curve shows which represents the formation of basic salt (weak monobasic acid+NaOH), then there is a rapid rise in conductance because of the strong dissociation of the basic salt that enhances the concentration of ions in the solution.