In the context of mobile devices, what does the term tethering involve?

Question:
In the context of mobile devices, what does the term tethering involve?

• connecting a mobile device to a USB port on a computer in order to charge the mobile device
• connecting a mobile device to a hands-free headset
• connecting a mobile device to another mobile device or computer to share a network connection
• connecting a mobile device to a 4G cellular network

Explanation: Tethering allows a laptop or PC to use the Internet connection of a mobile device such as a cell phone, usually through a cellular data connection. This allows devices to connect to the Internet in locations where there is no Wi-Fi or cabled connection, but where there is still a cellular data connection.

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