Which of the following statements best summarises the project of the 'Nash Equilibrium refinement programme' in game theory?. Philosophy

In the refinement programme, economic game theorists employ the concept of Nash Equilibrium in a refinery.
In the refinement programme, game theory deals with co-ordination games, such as the 'Stag Hunt' and 'Battle of the Sexes'.
In the refinement programme, economic game theorists look for concepts that are employed in addition to Nash Equilibrium, such as dynamic games.
In the refinement programme, economic game theorists look for concepts that refine Nash Equilibrium, in order to narrow down multiple equilibria.

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