Two rectangular blocks, $X$ and $Y$, of the same material have different dimensions but the same overall resistance. Which of the following equations is correct?

A.     resistivity of $X \times {\text{length of }}X = {\text{resistivity}}$ of $Y \times {\text{length of }}Y$

B.     $\frac{{{\text{length of }}X}}{{{\text{cross sectional area of }}X}} = \frac{{{\text{length of }}Y}}{{{\text{cross sectional area of Y}}}}$

C.     resistivity of $X \times {\text{cross sectional area of }}X = {\text{resistivity of }}Y \times {\text{cross sectional area of }}Y$

D.     $\frac{{{\text{length of }}X}}{{{\text{cross sectional area of }}Y}} = \frac{{{\text{length of }}Y}}{{{\text{cross sectional area of }}X}}$

B