Final answer:
Both Jane and Bill have a dominant strategy of confessing, due to the structure of the game, which assumes rational decision-making and individual incentives.
Step-by-step explanation:
The question targets the strategy that Jane should adopt in a hypothetical bank robbery scenario involving game theory concepts. If Jane trusts Bill to stay silent, the optimal choice for her is also to stay silent to minimize their combined sentence.
However, if she believes Bill will confess, her best response would be to confess too, to avoid receiving the longest sentence. Both Jane and Bill have a dominant strategy which is to confess, as it is the best response regardless of what the other person does, leading to a Nash Equilibrium of both parties confessing.