oose the correct sentence that describes the diagram

a$.$ The employee may be SALARIED or HOURLY and must be a TECHNICIAN, SECRETARY, ENGINEER, or MANAGER.

b$.$ None of these

c$.$ It is optional for the employee to be a manager, but they must only be salaried or hourly and have one of the following positions: technician, secretary$,$ or engineer.

d$.$ This person may hold the positions of technician, secretary$,$ engineer, or manager, and they must be paid a salary or an hourly wage.