Which cloud service model allows a user to outsource security responsibilities to the cloud provider?

The correct answer is PaaS (Platform as a Service). This cloud service model allows users to focus on developing their applications without needing to manage the underlying infrastructure, including security measures. With PaaS, the cloud provider typically takes responsibility for managing a significant portion of the security aspects, such as the operating system, databases, and middleware, offering built-in security features and protections.

Users of PaaS can deploy code or applications with a level of confidence, knowing that the provider is handling much of the security required to keep the platform operational and compliant. This alleviates users from the burden of managing security measures at various layers since the provider is trusted to maintain those standards.

In contrast, IaaS (Infrastructure as a Service) generally requires users to manage the security of the virtual machines, networking, and storage on top of the infrastructure provided. SaaS (Software as a Service) delivers software applications over the internet while also managing security but is focused more on software rather than the development environment. CaaS (Containers as a Service) gives users container management, typically requiring them to manage security components like network firewalls and container environments themselves.