If you plan to host a web application in the Azure platform as a (AZ-900)

Correct answer: B) No.
Azure Web Apps is a platform-as-a-service (PaaS) offering, which means that the underlying infrastructure and operating system are managed by Azure. When you use Azure Web Apps, you don't have direct access to or control over the underlying operating system. Instead, Azure takes care of the infrastructure, allowing you to focus on developing and deploying your web applications without managing the underlying hardware or operating system.
If you require more control over the operating system and underlying infrastructure, you might consider using Azure Virtual Machines (VMs) or other infrastructure-as-a-service (IaaS) solutions within Azure. With Azure VMs, you have more control and responsibility over the operating system configuration and maintenance.