Source set: Product tab lists Product/Units sold/Unit price/Variable cost/Returns: Core/630/$48/$31/22; Plus/450/$72/$48/20; Flex/546/$56/$35/31; Edge/400/$68/$45/13. Margin note says net margin = (units sold - returns) times (unit price - variable cost). Condition: Classify statements about net margin using the margin note. Statements: I. Flex has the greatest net margin. II. Returns should be added to units sold before calculating net margin. For each statement, mark True if it follows from the sources under the condition, otherwise mark False. Which classification is correct?