Adam is designing an embedded system, which needs to provide low-power, peer-to-peer communications. Which of the following technologies is the best answer to this purpose?

Zigbee is specifically designed for this type of using purpose. On the other hand, narrowband radios are not typically in use for this type of purpose, and baseband radio requires very large antennas to use the low-frequency spectrum. Cellular options require a carrier and are not well suited to direct peer-to-peer configurations.