What model provides complete infrastructure services and allows customers to install software on provisioned servers?

Infrastructure as a Service (IaaS) is the correct answer because it delivers virtualized computing resources over the internet. With IaaS, customers gain access to essential infrastructure services such as storage, networking, and computing power, enabling them to run and manage their applications and software. Importantly, IaaS allows users to install and configure the applications they need on the provisioned servers, providing them with significant flexibility and control over their environment.

In contrast, Platform as a Service (PaaS) is designed for developers who want to build applications without worrying about the underlying hardware and software layers. While it provides various tools and services to assist in application development, it does not offer the same degree of server-level access and customization that IaaS does.

Software as a Service (SaaS) delivers software applications over the internet on a subscription basis, where users typically cannot modify the underlying infrastructure or software; they only interact with the application as provided by the vendor.

Cloud Hosting is a broader term often used to describe services that may include a mix of IaaS, PaaS, and SaaS, but does not specifically refer to the infrastructure level of service nor the ability to install software on provisioned servers in the same