Why do grocery stores typically place milk at the back of the store rather than near the entrance?

Supermarkets and grocery stores employ various strategic product placement techniques to influence consumer behavior. One classic example involves a staple item that most shoppers need to purchase regularly. Retailers have developed a specific placement strategy for this item that affects the entire shopping experience and ultimately increases basket size. Test your knowledge of retail strategy in the food industry with this question about strategic product placement.

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To ensure the milk stays cold by minimizing its transport distance from delivery trucks to refrigeration units
To force customers to walk through the entire store, increasing exposure to other products and impulse purchases
Because milk was traditionally stored in the back of farms, and grocery stores maintain this historical arrangement
To group all refrigerated products together in one energy-efficient refrigeration zone