Orange Inc. issued 20,000 incentive stock options with an estimated value of $5 per share. The options vest over two years - half in 2019 (the year of issue) and half in 2020. Five thousand options are exercised in 2021 with a bargain element on each option of S10. a. What is the book-tax difference for 2019? (Amount and nature) b. What is the book-tax difference for 2020? (Amount and nature) c. What is the book-tax difference for 2021? (Amount and nature)