Given the following Ending Inventory errors for the Portland Company: Year Ending Inventory Error 2020 Understated $40 2021 Understated $30 Indicate the error in the following items: Select one: a. 2021 Net Income 12/31/21 Retained Earnings O b. c. d. e. Overstated $40 Understated $70 2021 Net Income 12/31/21 Retained Earnings Understated $70 Overstated $10 2021 Net Income 12/31/21 Retained Earnings Understated $30 Understated $70 2021 Net Income 12/31/21 Retained Earnings Overstated $10 Understated $30 2021 Net Income 12/31/21 Retained Earnings Overstated $30 Overstated $10