Jenstar(established in 2015) is in the process of updating its accounting policies for inventory costing, depreciation and amortization. Jenstar purchased a patent with no residual value on January 1,2016 for $15,300. The patent was being amortized over its legal life of 17 years using the straight line method the company decided to change the useful life to a more accurate total of 11 years on January 1 2020. Select the accounting change necessary in this situation. Select the approach which should be used: prospective/retroactive with restatement/retroactive no restatement