Which of the following statements must be true about the data sets A and B displayed in the histograms above? The mean of data set A is equal to the mean of data set B. The mean of data set A is equal to the mean of data set B. A The median of data set A is equal to the median of data set B. The median of data set A is equal to the median of data set B. B The range of data set A is equal to the range of data set B. The range of data set A is equal to the range of data set B. C The standard deviation of data set A is less than the standard deviation of data set B. The standard deviation of data set A is less than the standard deviation of data set B. D The standard deviation of data set A is greater than the standard deviation of data set B.