I don't want the solution. I just want to know what is the MEANING of the question?

57.  In figure value of resistors to be connected between C and D so that the resistance of the entire circuit between A and B does not change with the number of elementary sets used is

$$\begin{gathered} \left(A\right) R \left(B\right) R\left(\sqrt{3} - 1\right) \\ \left(C\right) 3 R \left(D\right) R\left(\sqrt{3} + 1\right) \end{gathered}$$