On April 1, 2019, Orbit Services received $9,600 in advance of performing the services from a customer for three months of service-April, May and June. What would be the journal entry to adjust the accounts at the end of May? (Do not round any intermediate calculations, and round your final answer to the nearest dollar.) OA. Debit Uneamed Revenue $6,400, and credit Service Revenue $6,400 OB. Debit Unearned Revenue $9,600, and credit Service Revenue $9,600. OC Debit Service Revenue $3,200, and credit Unearned Revenue $3,200 OD. Debit Service Revenue $6,400, and credit Accounts Receivable $6,400