The cost to produce was $20 per unit in 2019. During 2020, it has increased to $23 per unit. In 2020, Supplier Company has offered to supply for $18 per unit. For the make-or-buy decision:_____.a. incremental costs are $2 per unit.
b. differential costs are $7 per unit.
c. net relevant costs are $2 per unit.
d. incremental revenues are $7 per unit.