A company wants to implement an IoT solution using the service available in Azure. Which of the following would meet the below requirement? 
“Secure communications between millions of IoT devices.”

Answer options:

A.IoT Hub
B.IoT solution accelerators
C.IoT Edge
D.Azure Time Series Insights

Answer – A 
The Microsoft documentation mentions the following. 

Since this is clearly mentioned in the documentation, all other options are incorrect. 
For more information on Azure IoT Hub, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/iot-hub/about-iot-hub