Final answer:
The correct answer is b) PaaS (Platform as a Service), which allows companies to develop, test, deploy, and manage cloud-based applications using provided infrastructure and tools without managing the infrastructure themselves.
Step-by-step explanation:
The question refers to a scenario where a company is looking for a way to develop and serve cloud-based applications by leveraging a service provider's infrastructure and tools. The correct answer is b) PaaS, which stands for Platform as a Service. This cloud computing model provides customers with a platform that includes infrastructure, programming languages, and tools needed for application development. With PaaS, companies can build, test, deploy, and manage their applications without worrying about underlying infrastructure management.