Final answer:
Option (A), The servers provisioned by customers on a vendor-managed virtualization platform are categorized as IaaS (Infrastructure as a Service), which allows the management of virtualized computing resources over the internet.
Step-by-step explanation:
Servers provisioned by customers on a vendor-managed virtualization platform are categorized as IaaS (Infrastructure as a Service). This service model provides virtualized computing resources over the internet. In this setup, the vendor manages the infrastructure, including servers, storage, and networking components, while the customer is responsible for installing, configuring, and managing their own software, which can include operating systems, middleware, and applications.
PaaS (Platform as a Service) provides customers with a platform allowing them to develop, run, and manage applications without the complexity of building and maintaining the infrastructure. SaaS (Software as a Service) is a model in which software applications are hosted by the service provider and made available to customers over the internet. Lastly, DaaS (Desktop as a Service) provides virtual desktops hosted on a centralized server.