Which two options can you use to achieve this goal?

You are responsible for mobile app development for a company. The company develops apps on Windows Phone, iOS, and Android. You plan to integrate push notifications into every app.

You need to be able to send users alerts from a backend server.

Which two options can you use to achieve this goal? Each correct answer presents a complete solution.
A . Azure Notification Hubs
B . Azure SQL Database
C . Azure Mobile App Service
D . Azure Web App
E . a virtual machine

Answer: A, C