Burt, the CFO of Amber, Inc., is granted stock options in 2013 that qualify as incentive stock options. In 2018, the rights in the stock become freely transferable and not subject to a substantial risk of forfeiture. Burt exercises the stock options in 2017 when the option price is $75,000 and the fair market value of the stock is $90,000. He sells the stock in 2021 for $150,000. What are the regular income tax consequences and the AMT consequences for Burt in:
a. 2013?
b. 2017?
c. 2018?
d. 2021?