Answer: The right answer is C.
Step-by-step explanation:
In the Cloud Computing world, we can find different type of services offered by service providers that owns resources in the cloud, like PaaS (Platform as a service), SaaS (Software as a Service) and IaaS (Infraestructure as a Service).
All of them are scalable and flexible, allowing to the customer to pay only for that he currently needs.
IaaS involves a service that includes storage (matching the current needs of the customer), processing (i.e. Web servers, applications servers, streaming servers, ect) and networking (virtualization and software-defined networks).