Which of the Following Is True About Standard Deviation

Which of the following is true about standard deviation?

A) The first step in calculating the standard deviation is calculating the square root.
B) The second step in calculating the standard deviation is to subtract each measurement from the intermediate value and then square that difference.
C) The last step in calculating the standard deviation is to sum the squared values and divide by the number of values minus one.
D) Standard deviation is a type of average where the positive and negative numbers sum to zero.
E) The amount of difference of the measurements from the central value is called the sample standard deviation.