3) On June 20, 2013, Parker Services received $2,400 in advance from a customer for one month's service. The journal entry to adjust the accounts at the end of June would be which of the following? 2 Points Debit Service revenue $1,600 and credit Unearned service revenue $1,600 Debit Unearned service revenue $800 and credit Service revenue $800. Debit Unearned service revenue $2,400 and credit Service revenue $2,400. O Debit Service revenue $800 and credit Accounts Debit Service revenue $800 and credit Accounts receivable $800