When a Company Uses a Staffing Firm to Acquire Contingent

When a company uses a staffing firm to acquire contingent workers,which of the following may be true?

A) The contingent workers can legally be discriminated against by the company using the staffing firm's services because they are not employees.
B) The contingent workers must be treated as employees of the company hiring them, and not as independent contractors.
C) The contingent workers can argue that there is joint liability between the staffing firm and the company hiring them.
D) The contingent workers are transferred to the payroll of the company using the staffing firm's services.