A co-worker is considering quitting his or her job in order to pursue a graduate education on a full-time basis. In calculating the rate of return of an advanced education for a person in this situation, what is the largest opportunity cost that should be included as the costs of the investment? Question 7 options: The cost of tuition and fees The cost of books The income that could have been earned had the person worked full-time instead of going back to school. The difference in income that the advanced education could bring