The 3 unit class actually. It's whatever the retake value was. I had a similar situation. I took a 3 english semester hour class with a C and retook it at 5 quarter hours (3.3 semester hours) with an A. The 3.3 semester hour class with the A was counted in my GPA and in my prereq list. It's like the original class never happened in terms of GPA calculations and prereq lists.