Which of the Following Is True Regarding the Standard Deviation

Which of the following is true regarding the standard deviation?

A) It indicates the degree of variation in the values in such a way as to be translatable into a normal curve.
B) One standard deviation above and below the midpoint in a normal distribution includes approximately 68% of the area underneath the curve.
C) + or - 1.96 standard deviations above and below the midpoint in a normal distribution includes 95% of the area underneath the curve.
D) The standard deviation can be approximated by dividing the range of the data by 6.
E) All of the above are correct.