The following statements are about the relationship between typical total product (TP), average product (AP), and marginal product (MP) curves. Which statement is correct? O If TP is at a maximum, MP must be zero. O If TP is at a maximum, AP must be zero O If TP is at a maximum, MP must be at a maximum O If TP is at a maximum, AP must be at a maximum O If TP is at a maximum, both AP and MP must be at a maximum.

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