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

A payment of $591 to a creditor was posted as a debit of $5,911 to Accounts Payable and a credit of $591 to Cash.

A transaction was not posted.

Cash received from customers on account was posted as a debit of $165 to Cash and a credit of $165 to Accounts Payable.

A payment of $144 for insurance was posted as a debit of $94 to Prepaid Insurance and a credit of $94 to Cash.