Pho Saigon Noodles and Catering accumulates the following adjustment data at December 31.

1. Services provided but unbilled total $750.

2. Food supplies of $300 have been used.

3. Utility expenses of $300 are unpaid.

4. Unearned revenue of $450 has been earned.

5. Salaries of $1,000 are unpaid.

6. Prepaid insurance totaling $445 has expired.

For each of the above items, indicate the following.

(a) The type of adjustment (prepaid expense, unearned revenue, accrued revenue, or accrued expense).

(b) The accounts before adjustment (overstatement or understatement).