Discussion
Which of the following communication systems is not suitable in IoT integration ?
Answer: D
The key is I2C, and the other candidate is IRDA.
Bluetooth and WiFi are wireless links that connect IoT devices to phones, gateways and the internet, so they are suitable. I2C is a two-wire serial bus for connecting chips on one board over a short distance, such as a sensor to a microcontroller. It is not a link between separate devices or to a network, so the key treats it as not suitable for IoT integration. It is, however, widely used inside IoT devices.
IRDA is infrared, short range and needs a clear line of sight, which also limits it for IoT. The question gives no basis for ranking the two, so this follows the key.
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