5. Which of the following is correct? a. The short-run, but not the long-run, aggregate supply curve is consistent with the idea that nominal variables do not affect real variables. b. The long-run, but not the short-run, aggregate supply curve is consistent with the idea that nominal variables do not affect real variables. c. The long-run and short-run supply curves are both consistent with the idea that nominal variables affect real variables. d. Neither the long-run nor the short-run aggregate supply curve is consistent with the idea that nominal variables affect real variables.