Which of the following is the income statement formula for the variable costing method?

Sales Revenue - All Variable Costs = Contribution Margin - All Fixed Expenses = Operating Income

Sales Revenue - Cost of Goods Sold = Gross Margin - All Fixed Expenses = Operating Income

Sales Revenue - Variable Manufacturing Costs = Contribution Margin - Fixed Manufacturing Costs = Operating Income

Sales Revenue - Cost of Goods Sold = Gross Margin - Selling and Administrative Expenses = Operating Income