Complete the following activities:A. Using the Internet, review at least 3 articles on Profit-Cost-Volume relationship. Summary (300 words or more) the articles in your own words.B. As a manager, why is Profit-cost-volume important in planning? Support your response with numerical example(s)C. Using the Internet, review at least 3 articles on Variable Costing. Summary (300 words or more) the articles in your own words.D. As a manager, discuss how you would use Variable Costing in managerial decisions Support your response with numerical example(s)