Which one is the correct graph (figure) for the corresponding acid base titration?

A weak acid (or base) is titrated against a strong base (or acid) and the volume V of a strong base (or acid) is plotted against the $\mathrm{pH}$ of the solution (as shown in figure). The weak electrolyte (i.e. acid or base) could be:

Titration curves for $0.1 \mathrm{M}$ solutions of three weak acids $\mathrm{HA},{\mathrm{HA}}_2$ and ${\mathrm{HA}}_3$ with ionization constants ${\mathrm{K}}_1,{\mathrm{K}}_2$and ${\mathrm{K}}_3$ respectively are plotted as shown in the figure. Which of the following is/are true?

Titration curves for $0.1 \mathrm{M}$ solutions of three weak acids $\mathrm{HX},\mathrm{HY}$ and $\mathrm{HZ}$ with ionization constants ${\mathrm{K}}_1,{\mathrm{K}}_2$ and ${\mathrm{K}}_3$, respectively as shown in figure below. The volume of $\mathrm{NaOH}$  added is in $\mathrm{mL}.$