In the Spearman's rank correlation coefficient, when the ranks are equal, the formula is

A. $$1 - \frac{{\left[ {6\sum {D^2} + \frac{1}{2}\left( {{m^2} - m} \right) + \frac{1}{2}\left( {{m^2} - m} \right) + .....} \right]}}{{{N^3} - N}}$$

B. $$1 - \frac{{6\left[ {\sum {D^2} + \frac{1}{{12}}\left( {{m^3} - {m_1}} \right) + \frac{1}{{12}}\left( {{m^3} - {m_2}} \right) + .....} \right]}}{{{N^3} - N}}$$

C. $$1 - \frac{{\frac{1}{2}\left[ {\left( {{m^3} - m} \right) + \frac{1}{2}\left( {{m^3} - m} \right) + .....} \right]}}{{{N^3} - N}}$$

D. None of the above

Answer: Option B