What Distinguishes the Right to Manage Negotiating Regime with the Pareto-Efficient

What distinguishes the right to manage negotiating regime with the Pareto-efficient negotiating regime?

A) The first regime refers to the set of wage-employment outcomes that lie on the contract curve, while the second refers to the set of wage-employment outcomes that lie on the labour demand curve.
B) In the first regime, there is a tradeoff between wages and employment levels, but that is not the case for the second regime.
C) In the first regime, some of the union members might be unemployed, but that is not possible for the second regime.
D) The negotiated wage is always higher in the second regime than it is in the first regime.
E) In the first regime, the parties bargain only over the wage, while in the second, they bargain over both wages and employment levels.