Where was the adeno-associated virus (AAV) first identified in the 1960s?

A. Laboratories of Bob Atchison at Stanford and Wallace Rowe at UC Berkeley
B. Laboratories of Bob Atchison at Harvard and Wallace Rowe at MIT
C. Laboratories of Bob Atchison at Pittsburgh and Wallace Rowe at NIH
D. Laboratories of Bob Atchison at Yale and Wallace Rowe at Princeton
Answer: 