For each of the following situations, indicate whether you agree or disagree with the financial reporting practice employed and state the accounting concept applied $($if you agree$)$ or violated $($if you disagree$).$Wagner Corporation adjusted the valuation of all assets and liabilities to reflect changes in the purchasing power of the dollar.Spooner Oil Company changed its method of accounting for oil and gas exploration costs from successful efforts to full cost. No mention of the change was included in the financial statements. The change had a material effect on Spooner's financial statements.