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Which restrictive practice is an example of bundling? {:} A unique supermarket chain sells only its self-branded products. {:} A mobile phone manufacturer requires all retailers to sell its new phone at a price of at least $299, {:} A supermarket offers a free pack of hot dog buns with a purchase of hot dogs for the Fourth of July. {:} MNone of the choices are correct. {:} Retailers sell an electric grill at a price of $5, significantly undercutting the market