please help wirh the red portion, and show work.

also specify the time period based off of the 3 possible answers.

thanks!

SHEFFIELD CO. TRIAL BALANCE JUNE 30, 2020 Debit Credit Cash $3,227 Accounts Receivable $2,874 Supplies 1,157 Equipment 4,157 Accounts Payable 3,023 Unearned Service Revenue 1,557 Common Stock 6,357 Retained Earnings 3,357 Service Revenue 2,737 Salaries and Wages Expense 3,757 Office Expense 1,297 Totals $14,799 $18,701 Each of the listed accounts should have a normal balance per the general ledger. An examination of the ledger and journal reveals the following errors. 1. Cash received from a customer on account was debited for $570, and Accounts Receivable was credited for the same amount. The actual collection was for $750. 2. The purchase of a computer printer on account for $857 was recorded as a debit to Supplies for $857 and a credit to Accounts Payable for $857. 3. Services were performed on account for a client for $890. Accounts Receivable was debited for $890 and Service Revenue was credited for $89. 4. A payment of $65 for telephone charges was recorded as a debit to Office Expense for $65 and a debit to Cash for $65. 5. When the Unearned Service Revenue account was reviewed, it was found that service revenue amounting to $682 was performed prior to June 30 (related to Unearned Service Revenue). 6. A debit posting to Salaries and Wages Expense of $1,027 was omitted. 7. A payment on account for $206 was credited to Cash for $206 and credited to Accounts Payable for $260. 8. A dividend of $932 was debited to Salaries and Wages Expense for $932 and credited to Cash for $932. Month Ended June 30, 2020 June 30, 2020 Year Ended June 30, 2020 June 30, 2020 Debit Credit Cash 3277 Accounts Receivable 2694 Supplies 300 Equipment 5014 Accounts Payable 2557 Unearned Service Revenue 875 Common Stock 6357 Retained Earnings 2425 Service Revenue 4220 Salaries and Wages Expense 3852 Office Expense 1297 Utilities Expenses Totals 16434 16434