During 2019, it cost Sheffield Corp. $14 per unit to produce part T5. During 2020, it has increased to $15 per unit. In 2020, Southside Company has offered to provide Part T5 for $10 per unit to Sheffield. As it pertains to the make-or-buy decision, which statement is true? a. Differential costs are $5 per unit.
b. Incremental costs are $3 per unit.
c. Net relevant costs are $3 per unit.
d. Incremental revenues are $2 per unit.