Which of the following statements are true? I: Changes in ac…

Which of the following statements are true? I: Changes in accounting principles and changes in accounting estimates are accounted for the same way II: Changes in accounting principles are accounted for using a retrospective approach  III: Changes in accounting principles and the correction of an error could lead to an adjustment of beginning retained earnings. IV: Adopting a new accounting standard, like the new Revenue Recognition Principle, should be accounted for as a change in accounting principle.