Solution:The three-tier system for the settlement of grievances under the Model Grievance Procedure consists of:
The levels of the immediate supervisor: This is the first point of redressal. Here, .the aggrieved worker raises their issue with their immediate supervisor, seeking a solution.
The departmental or factory head: If the grievance isn't resolved at the supervisor level, it moves up to the department head or the overall head of the factory.
The bipartite grievance committee: If the first two levels fail to resolve the issue, the grievance is then taken up by a committee formed of representatives from
both the management and the workers. The aim is to ensure a speedy and amicable resolution of employee grievances.
Hence, correct options are (a), (b) and (c).