Which pricing strategy revolutionized language learning apps by offering basic services for free while charging for premium features?

In the world of language-focused products and services, marketing strategies often employ specific psychological techniques to appeal to different demographics. One particular phenomenon has revolutionized how language learning apps price their services. Test your knowledge of product marketing strategies in the linguistics industry with this challenging question about a pricing approach that has become standard practice.

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Freemium model
Cost-plus pricing
Penetration pricing
Bundle pricing