Final answer:
The least expensive cloud model for accessing services hosted by a cloud service provider is typically Software as a Service (SaaS), where users access cloud-based apps over the Internet on a subscription basis.
Step-by-step explanation:
If you are looking for the least expensive cloud subscription model that provides services strictly hosted by a cloud service provider, the option that generally aligns with this requirement is c) Software as a Service (SaaS). SaaS allows users to connect to and use cloud-based apps over the Internet. Common examples include email, calendaring, and office tools (like Microsoft Office 365). SaaS provides a complete software solution that you purchase on a pay-as-you-go basis from a cloud service provider. You rent the use of an app for your organization and your users connect to it over the Internet, usually with a web browser. All of the underlying infrastructure, middleware, app software, and app data are located in the service provider’s data center. The service provider manages the hardware and software, and with the appropriate service agreement, will ensure the availability and the security of the app and your data as well. SaaS can provide great advantages for most business scenarios, but it is particularly well-suited for small and medium businesses that prefer to use software without the hassle of maintaining it.