Which of the following cloud services provides a key benefit for developers by allowing access to services from diverse sources nationally or internationally?

Platform as a Service (PaaS) is the correct choice as it is specifically designed to provide developers with a robust environment to build, test, and deploy applications without dealing with the complexities of managing the underlying infrastructure. One of the key advantages of PaaS is its ability to support services from various sources, both nationally and internationally, enabling developers to integrate multiple APIs, databases, and other tools easily.

This extensive connectivity facilitates faster development cycles and enhances collaboration among development teams. It allows developers to leverage reusable components and services from different geographic regions, making it easier to create scalable, resilient applications that can operate efficiently in a global market. By abstracting the infrastructure layer, PaaS empowers developers to focus on coding and application functionality rather than infrastructure management, which is particularly beneficial in today's diverse and distributed development landscape.