
Explanation:
Box 1: Azure Platform as a service (PaaS)
Organizations typically use PaaS for these scenarios:
Development framework. PaaS provides a framework that developers can build upon to develop or customize cloud-based applications. Similar to the way you create an Excel macro, PaaS lets developers create applications using built-in software components. Cloud features such as scalability, high-availability, and multi-tenant capability are included, reducing the amount of coding that developers must do.
Box 2: Azure Virtual Machine (IaaS)
IaaS is the best fit for hosting App2 as it allows running applications interactively with the operating system of the server. In IaaS, the entire virtual machine including the operating system is managed by the user, providing more control over the environment. Azure offers various IaaS services such as Azure Virtual Machines, Virtual Machine Scale Sets, and Azure Kubernetes Service that can be used to host App2.
Reference:
https://azure.microsoft.com/en-us/overview/what-is-paas/