(a) The trustee by rule shall establish plans of group coverages for employees participating in the program and their dependents.
(b) The plans must include at least two tiers of group coverage, with coverage at different levels in each tier, ranging from the catastrophic care coverage plan to the primary care coverage plan. Each tier must contain a health coverage plan.
(c) The trustee by rule shall define the requirements of each coverage plan and tier of coverage.
(d) Comparable coverage plans of each tier of coverage established must be offered to employees of all participating entities.