[The following information applies to the questions displayed below.) Corbett's AMTI is $600,000 What is his AMT exemption under the following alternative circumstances? Exhibit 8-5. b. He is married and files a separate return Amount of AMT exemption Required information The following information applies to the questions displayed below.) Corbett's AMTI is $600,000. What is his AMT exemption under the following alternative circumstances? Exhibit 8-5. c. His filing status is single. Amount of AMT exemption ! Required information [The following information applies to the questions displayed below.) Corbett's AMTI is $600,000. What is his AMT exemption under the following alternative circumstances? Exhibit 8-5. d. His filing status is head of household. Amount of AMT exemption