Explain why the long-run aggregate-supply curve is vertical. Explain three theories for why the short-run aggregate-supply curve

Question:

Explain why the long-run aggregate-supply curve is vertical. Explain three theories for why the short-run aggregate-supply curve is upward sloping. What variables shift both the long-run and short-run aggregate-supply curves? What variable shifts the short-run aggregate-supply curve but not the long-run aggregate-supply curve?