Correct Answer: BTo ensure that NGINX is available on all Azure virtual machines after deployment using an Azure Resource Manager template, the preferred method is to use a Desired State Configuration (DSC) extension. DSC is a management platform used to automatically configure, deploy, and manage systems. Using a DSC extension allows administrators to define the desired state and ensure that NGINX is installed and configured across all virtual machines consistently. Other options, such as Deployment Center in Azure App Service, the New-AzConfigurationAssignment cmdlet, and a Microsoft Intune device configuration profile, are either not suitable for virtual machine scale sets or not directly related to the task of installing and configuring software on these virtual machines.