You plan to deploy an Azure IoT hub.

The IoT hub must support the following:

• Three Azure IoT Edge devices
• 2,500 IoT devices

Each IoT device will spend a 6 KB message every five seconds.

You need to size the IoT hub to support the devices. The solution must minimize costs.

What should you choose?

A. one unit of the S1 tier
B. one unit of the B2 tier
C. one unit of the B1 tier

D. one unit of the S3 tier

Explanation:
2500* 6 KB * 12 = 180,000 KB/minute = 180 MB/Minute.

B3, S3 can handle up to 814 MB/minute per unit.

Incorrect Answers:
A, C: B1, S1 can only handle up to 1111 KB/minute per unit
B: B2, S2 can only handle up to 16 MB/minute per unit.

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