The values of Van’t Hoff factors for $\mathrm{KCl}, \mathrm{NaCl}$ and ${\mathrm{K}}_2{\mathrm{SO}}_4,$ respectively, are _____.

Two beakers of capacity $500 \mathrm{mL}$ were taken. One of these beakers, labelled as $"\mathrm{A}"$, was filled with $400 \mathrm{mL}$ water whereas the beaker labelled $"\mathrm{B}"$ was filled with $400 \mathrm{mL}$ of $2 \mathrm{M}$ solution of $\mathrm{NaCl}$. At the same temperature, both the beakers were placed in closed containers of the same material and same capacity as shown in Figure.

At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that of $\mathrm{NaCl}$ solution.