As an HR Professional You Must Be Familiar with Particular

As an HR Professional you must be familiar with particular labor-based acts of congress. One such act is the Taft-Hartley Act which addressed right-to-work states and unions. What does right-to-work states mean for unions and employees?

A) An organization can fire employees if they're members of a union.
B) Union conducts the hiring process for an organization.
C) Employees are not required to join a union to work.
D) Employees must join the union in order to work.