Final answer:
The company is using IaaS (Infrastructure as a Service) cloud service, where they move their physical servers, routers, and switches to Amazon's servers as virtual machines and software-defined networks.
Step-by-step explanation:
The type of cloud service that the company is using in this scenario is IaaS (Infrastructure as a Service). IaaS allows businesses to access virtual computing resources, such as servers, storage, and networking, over the internet, and pay only for what they use. In this case, the company is moving their physical servers, routers, and switches to Amazon's servers as virtual machines and software-defined networks.