A development team needs to be able to make frequent code changes and to fix bugs without maintaining the OS layer. Which of the following cloud models meets the team's requirements?

Platform as a Service (PaaS) provides a fully managed runtime environment where the cloud provider handles OS installation, patching, and maintenance on behalf of the tenant. Developers interact only with the application layer - deploying code, managing dependencies, and fixing bugs without touching the underlying operating system. Examples include Azure App Service, Google App Engine, and AWS Elastic Beanstalk.

IaaS provides virtualized compute, storage, and networking but still requires the team to install, configure, and maintain the guest operating system.

SaaS delivers fully built software applications to end users and does not provide a platform for teams to deploy or manage their own custom code.

DBaaS manages only the database engine tier and does not provide a full application hosting platform for deploying and running custom application code.