If monetary neutrality is true, then:

a) Changes in the money supply will increase GDP in the short-run and long-run

b) Changes in the money supply will decrease GDP in the short-run and long-run

c) Changes in the money supply will not affect GDP in the short-run, but will affect GDP in the long-run

d) Changes in the money supply will affect GDP in the short-run, but will not affect GDP in the long-run