Salesperson Steve works for Broker Betty. Steve has been very busy of late and so he decides to hire an unlicensed assistant. Steve will pay all of the assistant's salary. Broker Betty will need a written agreement with:

a. Salesperson Steve only.
b. The unlicensed assistant only.
c. Both Salesperson Steve and the unlicensed assistant.
d. Neither Salesperson Steve and the unlicensed assistant.