1 Suppose = 3 N=3 and ( 1 ) = ( 2 ) = ( 3 ) = 1 v(1)=v(2)=v(3)=1. Which of the following payoff functions is superadditive? 1 point a) ( 1 , 2 ) = 3 v(1,2)=3, ( 1 , 3 ) = 4 v(1,3)=4, ( 2 , 3 ) = 5 v(2,3)=5, ( 1 , 2 , 3 ) = 5 v(1,2,3)=5; b) ( 1 , 2 ) = 3 v(1,2)=3, ( 1 , 3 ) = 4 v(1,3)=4, ( 2 , 3 ) = 5 v(2,3)=5, ( 1 , 2 , 3 ) = 7 v(1,2,3)=7; c) ( 1 , 2 ) = 0 v(1,2)=0, ( 1 , 3 ) = 4 v(1,3)=4, ( 2 , 3 ) = 5 v(2,3)=5, ( 1 , 2 , 3 ) = 7 v(1,2,3)=7; d) None of the above