
Explanation:
Azure Files are an example of PaaS (Platform as a Service) in Azure. Azure Files provides fully managed file shares in the cloud that can be accessed and used by different applications, platforms, and operating systems.
DNS server that runs on an Azure Virtual Machine is an example of Infrastructure as a Service (IaaS), since the VM provides the infrastructure for hosting the DNS server, and the user is responsible for managing and maintaining the underlying operating system and software.
Platform as a Service (PaaS) typically provides higher-level services, such as application frameworks, databases, and development tools, where the underlying infrastructure is abstracted away from the user, and the provider handles the management and maintenance of the platform.
Reference:
https://azure.microsoft.com/en-gb/overview/what-is-iaas/
https://azure.microsoft.com/en-gb/overview/what-is-paas/
https://azure.microsoft.com/en-gb/overview/what-is-saas/