Is it possible for a standard deviation to be equal to zero? Explain. Question content area bottom Part 1 Choose the correct answer below. A. A standard deviation can be zero if the data points are symmetric around the mean. B. A standard deviation can never be zero because there has to be variation in a data set. C. A standard deviation can be zero if the data points are symmetric around zero. D. A standard deviation can be zero if all the values are the same