You created a Standard availability test in Application Insights (AI1) pointing to an App Service (App1). To ensure failed test runs send email notifications to the subscription owners, what must you do?

To receive email notifications for failed availability tests, you must create an alert rule. An alert rule defines the conditions under which an alert is triggered (e.g., availability test failure) and specifies the action to take, such as sending an email. While an action group defines the recipients and notification methods (like email, SMS, or webhook), it needs to be associated with an alert rule to be activated. Creating an action group alone won't send notifications. The availability test is already created and implicitly enabled by its configuration. Enabling an alert is part of creating the alert rule itself; you don't enable it separately after creation.