The answer is: C
Explanation
The most accurate option in light of the provided principle is:
C: The settlement would bind X, Y, and Z whether or not they actually consented to the terms of the settlement.
Explanation:
The principle states that settlements arrived at in the course of conciliation proceedings, or an arbitration award or award of Labor Court or Tribunal, bind all parties to an industrial dispute, including present and future workmen and all parties who were summoned to appear in the proceedings. This means that the settlement reached by A, B, and C in 2006 would bind not only them but also any future workmen, including X, Y, and Z, whether or not they actually consented to the terms of the settlement. The binding effect is not dependent on their individual consent but on the fact that it is a settlement reached during conciliation proceedings related to the industrial dispute involving D.