Impala is currently purchasing a component part from a supplier at a cost of $$13$ per unit. They are however considering manufacturing the part in$-$house. Analysis has shown that the part can be manufactured for $$12,000$ fixed costs per period plus $$9$ per unit in variable costs. How many units must Impala manufacture to justify making the part?

Select answer from the options below

No more than $3,000$ units

At least $3,000$ units

At least $1,333$ units

At least $1,000$ units