Garden Plus is a manufacturer of raised garden beds. The firm is currently evaluating if it should sell its base garden beds in their current form or adding further features to them and selling them for a higher price. The current selling price is $300 per unit and the new selling price would be $380 per unit. When would it be financial attractive to add the additional features to the garden beds? a. When the total fixed costs to manufacture the garden beds is less than $300 per unit. b. When the incremental costs to add the additional features and the costs at the split off point are less than $80 per unit. c. When the incremental costs to add the additional features is less than $80 per unit. d. When the opportunity cost to add the additional features is more than $80 per unit