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Socks (pairs) 400 PPF 200 Shoes (pairs) Darron produces both shoes and socks. His Production Possibilities Frontier (PPF) is given above. Which of the following statements can correctly characterize the properties of Darron's PPF between shoes and socks? As Darron produces more socks, the opportunity cost of socks increases As Darron produces more shoes, the opportunity cost of shoes decreases It is efficient for Darron to produce any combination of shoes and socks that is inside of the PPF All statements are correct