What is a key design factor in ensuring reliable communication between IoT devices and gateways?

The correct answer is (A) Network Coverage.

Explanation: Network coverage is crucial because it ensures that IoT devices can reliably connect to gateways for data transmission. If the coverage is inadequate, devices may experience connectivity issues, leading to data loss or delayed communication. Good network coverage enables consistent and effective communication between a wide range of IoT devices and their respective gateways.