Given the following Ending Inventory errors for the Portland Company: Ending Inventory Error Year Overstated $30 2020 Understated $40 2021 Indicate the error in the following items: Select one: a. 2022 Net Income 12/31/21 Retained Earnings Understated $10 No error b. 2022 Net Income 12/31/21 Retained Earnings Overstated $10 No error C. 2022 Net Income 12/31/21 Retained Earnings Understated $40 Understated $40 d. 2022 Net Income 12/31/21 Retained Earnings Overstated $40 Understated $40 e. 2022 Net Income 12/31/21 Retained Earnings Understated $40 Overstated $40