On August 31, 2022, Nova Corporation signed a four-year contract to provide services for Minefield Company at $30,000 per year. Minefield will pay for each year of services on the first day of each service year, starting with September 1, 2022. Using the accrual basis of accounting, when should Nova recognize revenue?

a. On the last day of each year after the services have been provided
b. On the first day of each year when the cash is received
c. Only at the end of the entire contract
d. Equally throughout the year as services are provided