What Is a Grim Trigger Strategy in a Two Firm

Multiple Choice

What is a grim trigger strategy in a two firm repeated game?

A) A strategy where a firm will always aggress regardless of how the other firm acts
B) A strategy where a firm will always cooperate regardless of how the other firm acts
C) A strategy in which a firm is prepared to match whatever changes in strategy the competitor makes
D) A strategy in which a firm initially cooperates and then aggresses for the rest of the game as soon as the opponent aggresses
E) A strategy in which a firm is prepared to aggress when its opponent cooperates and cooperate when its opponent aggresses