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