Final answer:
Platform as a service (PaaS) refers to the cloud computing model where customers use the infrastructure and programming tools provided by a cloud service provider to develop their own applications.
Step-by-step explanation:
The correct answer is Platform as a service (PaaS).
Platform as a service (PaaS) refers to the cloud computing model where customers use the infrastructure and programming tools provided by a cloud service provider to develop their own applications. In this model, the cloud service provider offers a computing platform that includes various components like the operating system, programming language execution environment, database, and web server.
Examples of PaaS offerings include AWS Elastic Beanstalk and Windows Azure, which provide a complete platform for developers to build and deploy their applications without having to worry about the underlying infrastructure details.