Which of the following errors, each considered individually, would cause the trial balance totals to be unequal?

1. A transaction was not posted.

2. A payment of $67 for insurance was posted as a debit of $76 to prepaid insurance and a credit of $76 to cash

3. A payment of 4,450 to a credit was posted as a debit of $4,500 to accounts payable and a credit of $450 to cash.

4. Cash received from customers on account was posted as a debit of $720 to cash and a credit of $720 to accounts payable.