Given an Infinitely Repeated, Collusive Oligopoly Game, All but Which

Multiple Choice

Given an infinitely repeated, collusive oligopoly game, all but which of the following criteria should be met when devising a successful punishment strategy to be used in the event of another player's defection?

A) credible threats of punishment
B) negative pay- offs in the non- cooperative equilibrium
C) rapid detection of cheating by a rival
D) severe penalties imposed for cheating