19. In weighted goal programming, the objective is to: a. Minimize the weighted sum of deviations from the goals. b. Minimize the deviation from the most important goal. c. Meet the most important goal. d. Maximize the profit. e. None of these. 20. In preemptive goal programming, the first step is to: a. Minimize the weighted sum of deviations from the goals. b. Minimize the deviation from the most important goal. c. Meet the most important goal. d. Maximize the profit. e. None of these. 21. In preemptive goal programming, the most important thing is to: a. Come as close as possible to meeting all the goals. b. Achieve, or come as close as possible, to meeting the most important goal. c. Minimize the weighted sum of deviations from the goals. d. Maximize the profit. e. All of these