A manager is a salaried manager of a 20-unit condominium complex. The owner owns one of the units and is leaving town for six months. If the manager rents the owner's unit to a student for the six-month period, does he need a real estate license?

a. Yes, because the condominium complex contains more than ten units.

b. Yes, because the rental period the Manager had arranged was for more than one month.

c. No, because the complex consists of condominiums and not cooperative apartments.

d. No, because the rental period arranged was for not more than one year.