According to the original Phillips curve, policymakers could $q,$ unemployment at the cost of $q,$

A$.$ reduce; lower output

B$.$ reduce; higher inflation

C$.$ increase; higher inflation

D$.$ increase; lower output

According to the expectations$-$augmented Phillips curve, in the long run, policymakers

A$.$ can reduce the unemployment rate at the cost of lower output.

B$.$ can reduce the inflation rate only by reducing the unemployment rate.

C$.$ can reduce the unemployment rate at the cost of higher inflation.

D$.$ cannot affect the unemployment rate.