ZigBee is an 802.15.4 specification intended to be simpler to implement, and to operate at lower data rates over unlicensed frequency bands. a. True
b. False

True

Explanation:

Solution

ZigBee uses unlicensed frequency bands but operate at slower speed or data rates.

ZigBee: This communication is particular designed for control and sensor networks on IEEE 802.15.4 requirement for wireless personal area networks (WPANs), and it is a outcome from Zigbee alliance.

This communication level defines physical and  (MAC) which is refereed to as the Media Access Control layers to manage many devices at low-data rates.

system programmer option d is correct

because an operating system is software that manages computer hardware and system resources.

it would be a. excessive network collisions or d. slow connectivity between devices those would be my answer.