Need help, thank you! Will upvote!

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Windsor, Inc. received a check for $20640 on July 1 which represents a 6 month advance payment of rent on a building it rents to a client. Unearned Rent Revenue was credited for the full $20640. Financial statements will be prepared on July 31. Windsor's should make the following adjusting entry on July 31: O debit Unearned Rent Revenue, $3440; credit Rent Revenue, $3440. O debit Cash, $20640; credit Rent Revenue, $20640. O debit Rent Revenue, $3440; credit Unearned Rent Revenue, $3440. O debit Unearned Rent Revenue, $20640; credit Rent Revenue, $20640. Mary Richardo has performed $530 of CPA services for a client but has not billed the client as of the end of the accounting period. What adjusting entry must Mary make? Debit Accounts Receivable and credit Unearned Service Revenue O Debit Accounts Receivable and credit Service Revenue Debit Unearned Service Revenue and credit Service Revenue O Debit Cash and credit Unearned Service Revenue