Which of the following is a substantive analytical procedure?

1. Foot the accounts payable trial balance and compare with the general ledger.

2. Confirm accounts payable balances directly with vendors.

3. Multiply the commission rate by total sales and compare the results with commission expense.

4. Compute inventory turnover for each major product line and compare with industry standards.

Group of answer choices

All of the above are substantive analytical procedures

Item 4 only

Items 3 and 4

Item 3 only

Items 1, 3, and 4