Answer:
c. pay-as-you-go
Step-by-step explanation:
-Freemium means that a service is free but if the customers want additional features they have to pay for them.
-Subscription-based is when a customer takes a service for an established price during a specific period of time.
-Pay-as-you-go is when you pay only for the services you use.
-Razor-razor-blade is when a business sells a product at a low price to be able to sell a complementary good.
According to this, the answer is that the business model that is best illustrated is pay-as-you-go because the customer pays for the talk time he/she consumes each month.