Which cloud service offering allows customers to access a web application that is being hosted, managed, and maintained by a cloud service provider?

IaC (Infrastructure as Code) is a practice of managing infrastructure through code, not a cloud service model offering web applications.

SaaS (Software as a Service) is a cloud offering where the vendor hosts, manages, and maintains the entire application stack-from the application code to the underlying infrastructure-and customers access the software typically via a web browser over the internet.

IaaS (Infrastructure as a Service) provides virtualized computing resources; customers manage the operating systems, applications, and data, not just access a fully managed web application.

PaaS (Platform as a Service) provides a platform for developers to build, run, and manage applications without managing the underlying infrastructure, but the customer still deploys and manages their own application.