According to the welfare theory covered in the unit, which of the following statements is true? a. A general-equilibrium Pareto-efficient outcome may not be welfare maximising, due to lack of equity in the distribution of the resources of an economy. b. A general-equilibrium Pareto-efficient outcome will always be welfare maximising, according to the Second Welfare Theorem. c. A general-equilibrium Pareto-efficient outcome will always be welfare maximising, because all Pareto-efficient outcomes maximise welfare by definition. d. A general-equilibrium Pareto-efficient outcome will always be welfare maximising, according to the First Welfare Theorem