What should you do first?

You have 20 devices that connect to an Azure IoT hub.
You open Azure Monitor as shown in the exhibit.

You discover that telemetry is not being received from five IoT devices.
You need to identify the names of the devices that are not generating telemetry and visualize the data.
What should you do first?
A. Add the Number of throttling errors metric and archive the logs to an Azure storage account.
B. Configure diagnostics for Routes and stream the logs to Azure Event Hubs.
C. Add the Telemetry messages sent metric and archive the logs to an Azure Storage account.
D. Configure diagnostics for Connections and send the logs to Azure Log Analytics.