Answer:
The correct answer is the option C: a combination of the freemium business model and the pay-as-you-go business model.
Step-by-step explanation:
On the one hand, the freemium business model is a way of ensuring future business transactions that a company can use by allowing users to utilize basic features of the service, such as in this case the router.
On the other hand, the pay-as-you-go business model is a way that the company can charge their customer and it does it by requesting the payment of the service in advanced of the use, no matter how much they use it.
In conclussion, Blue Horizon Inc is using a combination of both the freemium model and the pay-as-you-go model due to the fact that they offer a free router for their customer but they pay the service of internet in advanced as well.