A teacher calculates the class average on an exam for each of his four classes and finds that the means are equal. Which statement below would lead to believe that this teacher was most pleased with the exam scores in his period 1 class?A. The scores for period 1 had the lowest median.B. The scores for period 1 had the highest median.C. The scores for period 1 had the lowest standard deviation.D. The scores for period 1 had the lowest IQR.