Meg and Russell talk about the new professor who was just hired to teach Accounting I. Russell mentions that he does not yet have a book, and Meg agreed to sell Russell a used accounting textbook for $$40$ for the upcoming semester. When the new semester begins, the new professor announces that a new custom Accounting text will be used that is only available in the campus bookstore. Russell wants a refund. Which of the following is Meg's best defense?

Group of answer choices

That a mutual mistake was involved and that Russell is$,$ therefore, not entitled to a refund.

That only a unilateral mistake was involved on Russell's behalf because Meg was aware of the change and that, therefore, Russell is not entitled to a discharge.

That Russell knew of the change of teacher and bore the risk of mistake.

That she did not commit fraud and that, therefore, Russell is not entitled to rescission.