In a State with a "Right-To-Work" Law

In a state with a "right-to-work" law

A) the employer and union agree that all members of the bargaining unit will join the union within a certain amount of time after becoming employed.
B) it is prohibited for a union and an employer to enter into an agreement that requires union membership or payment of union dues or "fees" as a condition of employment.
C) only persons who are already members of the union have the right to work for employers who have negotiated contracts with the union.
D) all employees are required to be free riders.