Final answer:
The configuration setting that allows for adjusting the boundary range of a wireless signal is power level controls, which manage the signal's range. So, option B is correct.
Step-by-step explanation:
The configuration setting that allows for adjusting the boundary range of a wireless signal is power level controls. Adjusting the power levels can increase or decrease the signal's range. The power level determines how much energy the Wireless Access Point (WAP) uses to broadcast its signal. Other options such as SSID broadcast, Maximum Transmission Unit (MTU), and Quality of Service (QoS) serve different functions.
The SSID broadcast relates to the visibility of the network, the MTU to the size of data packets that can be transmitted, and QoS to the prioritization of data traffic. Power level controls determine the strength or intensity of the wireless signal being transmitted by the wireless access point (WAP). By adjusting the power level, you can increase or decrease the range at which the wireless signal is effective. For example, increasing the power level will extend the range, while decreasing it will limit the signal's reach.