Answer:
c. When a mobile device is turned on, it connects to the nearest available base station through a control channel
Explanation:
A network is the communication and interconnection between Computer devices for sharing of data resources. The connection of these devices could be wireless or wired.
Wired network connection is the use of cables to connect devices, while wireless connection requires no wire.
Wireless communication could be electromagnetic, microwave, cellular etc. Cellular is mainly used for cell phone communication.
The cell phone has a database of cell tower connections and automatically connects to the nearest one through a control channel, when it's turned on.