If $\overline{PQ} \cong \overline{AB}$ and $\overline{AB} \cong \overline{CD}$, then $\overline{PQ} \cong \overline{CD}$. Which of the properties below does the lines signify ?

Question

$\begin{array}{1 1} (a)\; \text{transitive property} \\ (b)\; \text{symmetric property} \\ (c)\; \text{reflexive property} \\ (d)\; \text{none} \end{array}$