Where are the inflection points on the production curves (marginal product of labor curve and average product of

Where are the inflection points on the production curves (marginal product of labor curve and average product of

labor curve) and cost curves (marginal cost curve and average variable cost curve) of a firm in the short run? I understand that there is an inflection point on the total product of labor curve (TPL) which corresponds to the maximum point of the marginal product of labor curve (MPL) but not for other curves.