A cumulative effect of a change in an accounting principle is meansured as? A. The difference between prior periods net income and current net income under the old method and what would ahve been reported if the new method had been used in the prior years and the current year B. the difference between prior period's net income under the old method and what would have been reported if the new method had been used in the prior years C. the after taz difference between prior periods net income and current net income under the old method and would have been reported if the new method had been used in the prior years and the current year D. THe after tax difference between prior periods net income under the old method and what would have been reported if the new method had been used in the prior years