You have a VM named VM1 and an Azure Function named App1. You need an alert rule that will invoke App1 if VM1 stops. What should the alert rule use?

An action group is a collection of notification preferences and actions that can be triggered by an Azure alert. It allows you to define what happens when an alert fires, such as sending an email, calling a webhook, or triggering an Azure Function. Therefore, to invoke App1 (an Azure Function) when VM1 stops, you would configure an action group to call App1. An application security group (ASG) is used to group VMs and define network security policies based on those groups, not for triggering actions. A security group with dynamic device membership is a concept typically found in Active Directory for managing user or computer groups, not directly for Azure monitoring alerts. An application group is not a standard Azure resource type for this purpose.