In the Long Run, the Phillips Curve Will Be Vertical

Multiple Choice

In the long run, the Phillips curve will be vertical at the natural rate of unemployment if

A) the long-run aggregate demand curve is vertical at potential output.
B) the long-run aggregate demand curve is horizontal at the natural rate of inflation.
C) the long-run aggregate supply curve is vertical at potential output.
D) the long-run supply curve is horizontal at the natural rate of inflation.