A teacher has a science class of 20 students. She grades a recent exam using new digital scoring software and finds that the average test score for the 20 students is 81. However, she realizes a software error that incorrectly awarded 3 points to 4 students each and incorrectly subtracted 4 points from 3 students each. The teacher regrades these exams and again calculates the class's average test score. Which of the following is true? A The class average will decrease after rescoring. B The class average will increase after rescoring. C The class average will remain the same after rescoring. D There is not enough information provided to determine what will happen to the class average after rescoring.