Which of the following statements is correct with respect to effective internal control?

1)Employees who authorize transactions should not be in a position to record those transactions.

2)For efficiency, the entitys systems analyst(s) should be responsible for the day-to-day processing of data.

3)Employees who open mail containing payments from customers should immediately record those payments in the cash receipts journal.

4)Employees in the inventory warehouse should be responsible for authorizing the purchase of inventory.

5)All of the above.