You rendered services to a customer who had deposited $1,500 in advance. The deposit was recorded appropriately when received. The total sales for the services are $4,000. An invoice (= a bill) was sent out to the customer for the balance payment. How should this sales transaction be journalized? DR: Accounts Recelvable 2,500; CR: Revenues 2,500 DR: Accounts Recelvable 2,500 and Unearned Revenues 1,500; CR: Revenues 2,500 and Unearned Revenues 1,500 DR: A/R 2,500 and Unearned Revenues 1,500; CR: Revenues 4,000 DR: Cash 1,500 and Accounts Payable 2,500; CR: Revenues 4,000