Which of the following are correct representations of standard deviation?

A. \(\frac{1}{n} \sum\left(y_1-\bar{y}\right)\)

B. \(\frac{1}{n} \Sigma(y-\bar{y})^2\)

C. \(\sqrt{\frac{1}{n} \sum\left(y_1-\bar{y}\right)^2}\)

D. \(\sqrt{\left(\frac{\Sigma y}{n}\right)^2-\frac{\Sigma y^2}{n}}\)

E. \(\sqrt{\frac{\sum y^2}{n}-\left(\frac{\sum y}{n}\right)^2}\)

Choose the correct answer from the options given below: