Consider a pure exchange Edgeworth box economy with two consumers, A and B.Preferences for each consumer are given byu_A(x_A,y_A)=x_Ay_Au_B(x_B,y_B)=x_B+1/2y_BWhich of the following allocations in the form of(x_A,y_A,x_B,y_B)is considerto be Pareto efficient?(check all that apply)

a.(1, 3, 1, 3)

b.(1, 2, 1, 2)

c.(2, 4, 6, 8)

d.(3, 3, 0, 0)