GlobalCom Inc. is an Internet service provider. It provides a router free of charge when users sign up for a two-year wireless service plan. In this plan, users pay in advance irrespective of whether they use the Internet package during the two-year period or not. Which of the following business models does this scenario best illustrate?

a) the direct sales business model
b) the pay-as-you-go business model
c) a combination of the razor-razor-blade model and the subscription-based business model
d) a combination of the freemium business model and the pay-as-you-go business model