Which of the following is NOT one of the three main service models in cloud computing?

The three main service models in cloud computing are Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). These models represent different layers of service delivery, where IaaS offers essential computing resources like virtual machines and storage, PaaS provides a platform for developers to build and deploy applications without managing underlying hardware, and SaaS delivers software applications over the internet, allowing users to access them via a web browser without worrying about installation or maintenance.

Network as a Service (NaaS), while it plays a significant role in network management and services, is not classified among the primary cloud service models. Instead, it is often seen as a specialized offering that focuses specifically on network-related capabilities, such as virtual networks and bandwidth allocation. Understanding these distinctions helps clarify the core service models essential for cloud computing.