Until 1980, the most notable feature of Ireland's labor relations system was:

A) The prevalence of strikes
B) Peak-level bargaining
C) Enterprise unionism
D) A high union density rate

Peak-Level Bargaining

Collective bargaining that occurs at the top level of negotiations, involving senior representatives from unions and employers or governments.

Union Density Rate

The proportion of workers in a given sector or country who are members of unions, indicating the level of unionization.