What are the four stages of execution accounting? Select one O a. commitment, undelivered orders outstanding (UOO), Accrued Expenditures Unpa (AEU), Accrued Expenditures Paid (AEP) O b. unfilled customer orders, undelivered orders outstanding (UOO), Accrued Expenditures Unpaid (AEU), Accrued Expenditures Paid (AEP) O c. unfilled customer orders, undelivered orders outstanding (UOO), Fill customer orders uncollected, Accrued Expenditures Paid (AEP) O d. commitment, undelivered orders outstanding (UOO), Fill customer orders uncollected, Accrued Expenditures Paid (AEP)