The following transactions have been joumalized and posted to the proper accounts. March is the first month of business operations, Mar. 1 The business received $7,000 cash and issued common stock to stockholders. Mar. 2 Paid the first month's rent of $600. Mar. 3 Purchased equipment by paying $2,000 cash and executing a note payable for $3,000 Mar. 4 Purchased office supplies for $650 cash Mar. 5 Billed a client for $14,000 of design services completed. Mar. 6 Received $8,000 on account for the services previously recorded. What is the ending balance in the Service Revenue account? A $8,000 B. $14.000 C. $15,000 OD. $7,000