During 2021, it cost Marigold Inc. \$12 per unit to produce Part T5. During 2022, the cost has increased to $14 per unit. In 2022 , Ivanhoe Company has offered to sell the Part T5 for $9 per unit to Marigold. With regard to the make-or-buy decision, which statement is true? Differential costs are $5 per unit. Incremental costs are $3 per unit. Incremental revenues are $2 per unit. Net relevant costs are $3 per unit