Which of the following statements is true?

1)A open-item system is typically the type of accounts receivable system used by utilities. 2)A balance-forward system is typically the type of accounts receivable system used by utilities. 3)A pre-billing system is typically the type of accounts receivable system used by utilities. )4)A post-billing system is typically the type of accounts receivable system used by utilities. 5None of these answers are correct