Jayne has just begun attending university. This means she has to give up a job opportunity at the same campus. Which of the following should not be considered in the calculation of the opportunity cost of going to university? a. the value of books she purchase for courses O b. the cost of commuting to campus every day c. the cost of the nicer clothes she would need if she was working at the job O d. the wages she could have earned had she not gone to university O e. tuition fees