Strategic Interaction in a Duopoly

Consider a duopoly where two firms must decide whether to invest in a cost-reducing technology. If neither firm invests, each earns a profit of $8 million. If both firms invest, each earns a profit of $6 million. If one firm invests and the other does not, the investing firm earns $12 million and the non-investing firm earns $4 million. This strategic interaction is an example of which of the following?