Which of the following is correct?

a.A collective agreement can only provide for the deduction of union dues from the pay of employees in the bargaining unit who have become union members.

b.A collective agreement cannot provide for the deduction of union dues from the pay of employees in the bargaining unit in provinces that have passed right to work legislation.

c.A collective agreement could provide that union dues will be deducted from the pay of all employees in the bargaining unit whether or not they are union members.

d.Collective agreements provide that employees have the option of having dues deducted from their pay.