The Standard Deviation Can Be Defined as $\sqrt{\Sigma(D-\bar{D})^{2} P}$

The standard deviation can be defined as .

A) $\sqrt{\Sigma(D-\bar{D}) ^{2} P}$
B) $\sqrt{\Sigma(D-\bar{D}) P}$
C) $\sqrt{(D-\bar{D}) \rho}$
D) $\sqrt{(\bar{D}-D) P}$