The 68-95-99.7 rule states that in a normal distribution:

A. The probability of a random value to be within 2 standard deviations above the mean is 95%

B. The probability of a random value to be within 2 standard deviations above or 2 standard deviation below the mean is 95%

C. The probability of a random value to be between 1 and 2 standard deviations above the mean is 95%

D. 95% of all values are within 2 standard deviations from the mean