You need to migrate a web application that depends on a custom COM component to Azure. The solution must remain available if an Azure datacenter becomes unavailable and minimize cost. Which deployment should you recommend?

The correct answer is deploying a load balancer and a Virtual Machine Scale Set (VMSS) distributed across two availability zones. This option addresses the custom COM component dependency by using VMs, which allow for custom component installation, unlike App Services. Distributing the VMSS across availability zones provides high availability within a single Azure region at a lower cost than multi-region deployments, as data replication and cross-region networking are minimized. A load balancer ensures traffic distribution to the healthy instances. Deploying App Service web apps (options 1 and 4) is incorrect because App Services do not support custom COM components. Deploying a VMSS in two Azure regions (option 2) provides higher availability but at a significantly higher cost due to increased data transfer and resource duplication, which violates the "minimize cost" requirement.