The Prairie Clerical Workers Union wants to negotiate as the bargaining agent for a group of employees. Which of the following in necesary for this out OA. A vote of employees in which a majority of votes are in favour of the union. O B. At least two-thirds of all employees voluntarily join the union. O C. The union engages in unfair Inbour practices regarding the organization of the employees, D. A vote of employees in which a majority of all employees vote in favour of the union