In March 2021, Serengeti exercised an ISO that had been granted by his employer, Thunder Corporation, in December 2018. Serengeti acquired 2,450 shares of Thunder stock for the exercise price of $100 per share. The fair market value of the stock at the date of exercise was $140 per share. If an amount is zero, enter "0". a. What is Serengeti's 2018 AMT adjustment related to the ISO? Adjustment: 4 Amount: $ b. What is Serengeti's 2021 AMT adjustment related to the ISO? Adjustment: Amount: $ B