4B. Which one(s) of the following functions v(x, y) = 2x°y³ – 100, w(x, y) = 3(x + y) + 120, t(x, y) = ry- 150 is an ordinal utility function for a preference relation which admits u(x, y) = Bx!/2y!/2 + 120 as an utility function? (a) w only (b) v and w (c) v and t (d) v, w and t (e) none of the previous four statements is correct. %3D %3D

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