A company is currently hosting a multi-tier web application in Azure. The application now uses the Azure Web App service and the Azure SQL Database service. The front-end service is hosted in Azure Web Apps and the backend in an Azure SQL Database service. The application also uses Azure Functions. You want the Azure DevOps team to be notified whenever the front-end application fails to return a status code of 200. Which of the following would you use for this requirement?

Answer options:

A.Service Map feature in Azure Log Analytics
B.The Availability tests feature in Azure Application Insights
C.The Profiler feature in Azure Application Insights
D.The Application Map feature in Azure Application Insights

Answer – B 
You can use the Availability tests feature in Azure Application Insights. 
This is also mentioned in the Microsoft documentation. 

Since this is clearly mentioned in the Microsoft documentation, all other options are incorrect. 
For more information on availability tests in Azure Application Insights, please refer to the following link- 

https://docs.microsoft.com/en-us/azure/azure-monitor/app/monitor-web-app-availability