Which of the following disables a mobile device's radio to prevent wireless communication?

A) Tethering
B) Hotspot
C) Airplane Mode
D) Pairing

Airplane Mode disables a mobile device's radio to prevent wireless communication, allowing the user to use the device in areas where wireless communication is prohibited or when the user wishes to conserve battery life. Tethering, hotspot, and pairing are all functions that involve wireless communication and do not disable the device's radio.