When a plot of boiling point versus composition is plotted, then the type of graph that cannot be obtained is:

Which of the following graphs represents the behavior of ideal binary liquid mixture?

(Here, ${\mathrm{Y}}_{\mathrm{A}}$ and ${\mathrm{Y}}_{\mathrm{B}}$ are the mole fractions of components $\mathrm{A}$ and $\mathrm{B}$in vapour.)

The diagram given below depicts the boiling point as the function of composition of the mixture of ${\mathrm{CCl}}_4$ and ${\mathrm{SiCl}}_4$. Which of the following statement about the diagram is/are true?