Answer: Captive product pricing
Explanation: Captive product pricing refers to the strategy under which the company offers lower prices for the main product but earns revenue by charging higher for the captive products that are essential for the use of the main product.
In the given case, Hewlett packard are charging low for their printers but the prices of cartidges are high.
Hence from the above we can conclude that the above example depicts captive product pricing.