CompTIA A+ 220-1101 Practice Question

Bluetooth is the correct answer because it is specifically designed for short-range communication often needed for connecting wearable devices to smartphones, making it a typical technology used for Personal Area Networks (PAN). Infrared requires a direct line of sight and is not commonly used for health wearables due to the necessity of constant connectivity. RFID is primarily used for identification and tracking, offering different functionality compared to the synchronizations of a wearable device. WiMAX, on the other hand, is suited for much larger ranges and wouldn't be the most power-efficient or practical solution for communication between a wearable device and a smartphone.