A software company wants to offer a productivity suite over the internet as a ready-to-use application so customers don't install or manage infrastructure. Which cloud service type represents this delivery model?

Software as a Service (SaaS) is the correct answer because it provides a complete, ready-to-use application over the internet, managed entirely by the cloud provider. Customers simply access and use the software without needing to install, manage, or maintain any underlying infrastructure, operating systems, or applications. This aligns perfectly with the scenario where the company wants to offer a productivity suite as a ready-to-use application. IaaS (Infrastructure as a Service) provides only the foundational computing resources like virtual machines, storage, and networking, requiring the customer to manage the operating system, applications, and data. PaaS (Platform as a Service) offers a platform for developing, running, and managing applications without the complexity of building and maintaining the infrastructure, but the customer still deploys their own applications. On-premises refers to hosting everything in a local data center, which contradicts the goal of offering a service over the internet without customer infrastructure management.