A decision-maker's preferences over the set A=(a,b,c) are represented by the payoff function u for which u(a)=0, u(b)=1, and u(c)=4/ Are they also represented by the function u for which u(a)= -1, u(b)=0, and u(c)=2? How about the function w for which w(a)=w(b)=0 and w(c)=8?