In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

How did he earn his degree?, Context: In 1977, Schwarzenegger's autobiography/weight-training guide Arnold: The Education of a Bodybuilder was published and became a huge success. After taking English classes at Santa Monica College in California, he earned a BA by correspondence from the University of Wisconsin–Superior, where he graduated with a degree in international marketing of fitness and business administration in 1979.
by correspondence