The Ultimatum Game begins with the proposer's decision. In particular, the proposer can offer anywhere between $0 and $20 to the responder, and the responder then decides whether to accept or not. If the responder accepts, then both players get the money, divided as proposed. If the responder rejects the offer, then both players get nothing. To simplify, suppose the proposer must offer either $1 or $10. Suppose the responder can punish the proposer if the proposer offers $10. The proposer will be prompted to offer $1 if the responder is able to impose a penalty that is greater than at least $D. (Enter your response as an integer.)