During $2022,$ it costs Ernest, Inc. $$14$ per unit to produce part T$5.$ During $2023,$ it has increased to $$16$ per unit. In $2021,$ Asare Company has offered to provide Part T$5$ for $$13$ per unit to Ernest. As it pertains to the make$-$or$-$buy decision, which statement is true?

Question $5$ options:

Incremental costs are $$3$ per unit.

Incremental revenues are $$1$ per unit.

Net relevant costs are $$3$ per unit.

Differential costs are $$4$ per unit.