Which of the these is a weapon used by labor unions when negotiations with business owners fail?

1. Collective bargaining: In this method, representatives of the union and employees will meet to negotiate or deliberate on issues affecting the workers.

2. Work to rule: This involves the slowing down of rate of work by the worker. They will come to work but the rate of work will be slowed down by the workers.

3. Picket lines: This involves the workers staying at the entrance of the factory and refusing to work.

4. Threat to strike: The workers' union gives ultimatum to the employer that they will embark on strike if their demands are not met on time.

5. Strike: The workers will stay away completely from work. This is the ultimate weapon and sincerely will greatly affect the labor and hence production