You plan to migrate a web application accessed by external users. To minimize the administrative effort required to manage the application, which cloud deployment model should you recommend?

Platform as a Service (PaaS) is the best choice for minimizing administrative effort for a web application. PaaS provides a complete development and deployment environment in the cloud, including operating systems, programming language execution environments, databases, and web servers. This means you don't have to manage the underlying infrastructure, such as virtual machines or operating systems, significantly reducing administrative overhead. Software as a Service (SaaS) would be incorrect because it refers to a complete, ready-to-use application managed by a third party, not a platform for custom web application deployment. Infrastructure as a Service (IaaS) would be incorrect because it provides only the basic computing infrastructure (VMs, storage, networking), requiring you to manage the operating system, middleware, and runtime, which increases administrative effort. Database as a Service (DaaS) is a specific type of PaaS focusing only on database management, not the entire web application platform.