When accounting for employee purchases, effective internal controls could include which of the following?

Only those employees that need to make timely business expenditures should receive authorization.

To ensure timely expenditures, no pre$-$approval should be required for major purchases.

Employees should be required to provide receipts and justification for those receipts every six months.

The same employee should review receipts and supporting documents to ensure all expenditures are made appropriately.