When evaluating the impact of misstatements on the financial statements, auditors must use both the rollover and iron curtain approaches. Regarding these approaches, which of the following statements is correct?

a. The iron curtain approach quantifies the impact of current year and prior misstatements on the balance sheet.
b. The rollover approach quantifies the impact of current year misstatements on the balance sheet.
c. The iron curtain approach quantifies the impact of current year misstatements on the income statement.
d. The rollover approach quantifies the impact of current year and prior year misstatements on the balance sheet.