11. Which of the following statements is NOT true for the production possibility frontier to have a bowed shape? a) The opportunity cost of producing one good is always the same irrespective of the current level of production. b) When the opportunity cost of producing one good is increasing with the current level of production. c.) Resources are not equally suitable for two products; some are more suitable for one product than the other. d) The opportunity cost of producing one good is high when society already has a lot of that product