Explanation:

- Option 1: Workers and their organisations – These include employees, trade unions, and worker associations that represent the interests of the workforce in negotiations.

- Option 2: Employers and their organisations – This group includes individual employers and employer associations, who represent business and management interests in the industrial sector.

- Option 3: Government and the role of the State – Governments create laws, enforce regulations, and often mediate between employers and workers to maintain industrial peace.

- Option 4: All of the above – This is the correct answer. All three groups are crucial actors in industrial relations and interact to shape the working environment.