The diagram below shows the change in the length $X$ of a thin uniform wire caused by the application of stress $F$ at two different temperatures $T_1$ and $T_2$. The variation shown suggests that

The diagram shows stress vs. strain curve for the material $A$ and $B$. From the curves we infer that

The diagram shown below represents the applied forces per unit area with the corresponding change $X$ (per unit length) produced in a thin wire of uniform cross-section in the curve shown. The region in which the wire behaves like a liquid is