You plan to create the web apps shown in the table. What is the minimum number of App Service plans required to host those web apps?

The minimum number of App Service plans required is 2. Web App1 and Web App2 can share an App Service plan because they are in the same resource group (RG1), the same region (East US), and use the same operating system (Windows). App Service plans define the underlying compute resources, and these resources can be shared by multiple web apps as long as they meet these criteria. Web App3 requires a separate App Service plan because it uses a different operating system (Linux). App Service plans are OS-specific, meaning a Windows web app cannot run on a Linux App Service plan, and vice-versa. Therefore, even if it were in the same resource group and region, it would still need its own plan.