For a binary mixture at constant temperature and pressure, which of the following relation between activity coefficient (yi) and mole fraction (X;) obeys the Gibbs Duhem equation for a thermodynamically consistent system? Justify your answer A) In Y1 = -1+2x -x/?; In y2 = - x12 B) In Y1 =-1+2X1-X1?; In Y2 = x1 =- =- 2. =