In Spearman rank correlation coefficient $$ r_{s} = 1-\frac{6\sum d^{2}}{n\left(n^{2}-1\right)}$$, the maximum value of $$\sum d^{2}$$ in case of untied ranks is:

A

$$n$$

B

$$\frac{1}{4}{n\left(n^{2}-1\right)}$$

C

$$\frac{1}{2}{\left(n^{2}-1\right)}$$

D

$$\frac{1}{3}{n\left(n^{2}-1\right)}$$