Developers want to create a mobile application that requires a runtime environment, developer tools, and databases. The developers will not be responsible for security patches and updates. Which of the following models meets these requirements?

Container as a service (CaaS) offers a way to manage and deploy containers but does not inherently provide a full suite of developer tools or databases. While it allows developers to run applications in isolated environments, it typically requires more management of security and infrastructure than is desired by the developers in this scenario.

Infrastructure as a service (IaaS) provides virtualized computing resources over the internet, including servers, storage, and networking. However, it places the responsibility for managing the runtime environment and security updates on the developers, which contradicts their requirement to avoid handling security patches and updates.

Software as a service (SaaS) delivers software applications over the internet, typically on a subscription basis. While it handles updates and security, it does not provide the development tools or runtime environments that the developers need for application creation. This model is more focused on end-user applications rather than the development process itself.