The utility of a consumer consuming two goods, the quantities of which are x; and x2 is given by |U(x1,x2) = 7 + 24x1 3x12 + 8x2 2x; If H is the Hessian matrix for the utility function, then IH 1| = Select one: a. 4 b. -6 c. 24 d. 6 e. -4