How does HP use serialization to combat the counterfeit and grey market?

How does HP use serialization to combat the counterfeit and grey market?
A . It monitors the products sold through MAC addresses to ensure they are sold by authorized channels.
B . It tracks the cartridges through the supply chain to know exactly where they are sold, curtaining grey marketing trade.
C . It uses embedded code to determine in which regions the cartridges are sold.
D . It uses QR codes on interior and exterior packing to product partners from purchasing counterfeit and grey market products.

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Answer: D