Increase in both labor and capital productivity will result in:
A. Upward shift of the average and marginal product curves and downward shift of the average cost curves
B. Downward shift of the average and marginal product curves and downward shift of the average cost curves
C. Downward shift of the average and marginal product curves and upward shift of the average cost curves
D. Upward shift of the average and marginal product curves and upward shift of the average cost curves