During 2021 , it costs Bramble, Inc. $24 per unit to produce part T5. During 2022, the unit cost has increased to $27 per unit. In 2022, Southside Company has offered to provide Part T5 for $13 per unit to Bramble. No fixed costs are avoidable. Which of the following statements is true with regard to this make-or-buy decision? Differential costs are $14 per unit. Net relevant costs are $11 per unit. Incremental revenues are $3 per unit. Incremental costs are $11 per unit