A Nurse Who Has Accepted a Position as an Assistant

A nurse who has accepted a position as an assistant ICU manager is discussing unionization with the human resources (HR) director. The HR director says the nurse cannot join the union. What rationale should the HR director offer for this statement?

A) The nurse has never been in a union in the past.
B) The nurse must first complete orientation before being eligible to join the union.
C) The nurse must have worked in a hospital environment for at least 5 years.
D) Registered nurses hired as management are not eligible for collective bargaining.