Danah provides marketing services to many companies in Riyadh, in December 2019, Danah has performed services of 7,000 SR for a client and send him the bill on December 30. On January 10, 2020, Danah has received the payment from the client. The account related to the services performed that should appear on the income statement at the end of the year, December 31 is Select one: O a Services Expenses of 7,000 SR O b. Service Revenue of 7,000 SR O c Prepaid Expense of 7,000 SR O d. Unearned Revenue of 7,000 SR