Which of the following statements is true?I If the degree of operating leverage in a company is $4,$ it means the firm's total contribution margin grows four times as fast as its sales.Il The degree of operating leverage is computed by dividing sales by the contribution margin.Ill A company with high fixed cost structure will experience a greater increase in net operating income in a period ofincreasing sales volume than a company with lower portion of fixed costs.A$.$B$..$D$.$E$.$Statements I and IlI are true.All of the statements are true.Statements Il and III are true.Only statement IlI is true.None of the statements are true.