You are developing a cross-platform app by using Microsoft Visual Studio 2015. The app will be available to Windows, Android, and iOS devices.
You need to gather usage telemetry for the app across all three platforms.
What should you use?

A.
Code Coverage

B.
Diagnostic Tools

C.
IntelliTrace

D.
Application Insights

Explanation:
Application Insights works by adding an SDK into your app, which sends telemetry to the Azure portal. Application Insights support iOS, Android, and Windows
apps, J2EE and ASP.NET web applications, and WCF services.

https://azure.microsoft.com/en-us/documentation/articles/app-insights-get-started/