The accountant for Ronaldo Company makes the assumptions or performs the activities in the list that follows. Tell which of these concepts of accrual accounting most directly relates to each assumption or action: 

(a) periodicity, 

(b) going concern, 

(c) matching rule, 

(d) revenue recognition, 

(e) deferral,

(f) accrual. 

1. In estimating the life of a building, assumes that the business will last indefinitely 

2. Records a sale when the customer is billed 

3. Postpones the recognition of a one-year insurance policy as an expense by initially recording the expenditure as an asset 

4. Recognizes the usefulness of financial statements prepared on a monthly basis even though they are based on estimates 

5. Recognizes, by making an adjusting entry, wages expense that has been incurred but not yet recorded 

6. Prepares an income statement that shows the revenues earned and the expenses incurred during the accounting period