Kathy operates a gym. Her customers pay $500 for 50 aerobic classes that can be taken any time in a 24-month period. Kathy sells one of the agreements to a customer on June 30, 2022. Assuming the customer takes 10 lessons in 2022, how much of the income is Kathy required to recognize as income for 2022? a. $100 only if she is an accrual-basis taxpayer. b. $100 whether she is a cash or accrual-basis taxpayer. c. $125 only if she is an accrual-basis taxpayer. d. $500 whether she is a cash or accrual-basis taxpayer. e. None of the above is correct