The correct answer is Create an Azure Logic App with an HTTP request trigger and Modify the action group in Azure Monitor.

Create an Azure Logic App with an HTTP request trigger lets you accept the alert payload as an incoming webhook and then use actions such as the Microsoft Teams connector to format and post a message into the channel. The Logic App performs any needed transformation and orchestration so the alert becomes a readable Teams message.

Modify the action group in Azure Monitor is necessary so Azure Monitor will invoke the Logic App when the alert fires. Action groups are the mechanism Azure Monitor uses to deliver notifications and you add the Logic App endpoint as a webhook or Logic App action inside the action group.

Create an Azure Monitor workbook is incorrect because workbooks are for visualization and investigation of telemetry and they do not send alert notifications to external services like Microsoft Teams.

Create an Event Grid subscription to forward alerts to Microsoft Teams is incorrect because Event Grid is for event routing and it would still require an intermediary to transform and post the alert into Teams. It is not the standard direct notification path for Azure Monitor alerts.

Change the Diagnostics settings for the resource in Azure Monitor is incorrect because diagnostics settings control where resource logs and metrics are sent and they do not change how Azure Monitor sends alert notifications to channels such as Microsoft Teams.

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