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When you enable Internet Sharing on a Mac, it allows devices to access the internet through the Mac's internet connection by transforming the Mac into a Wi-Fi hotspot. Specifically, if the Mac is connected to the internet via Ethernet, enabling Internet Sharing will permit other devices to connect to the Mac's Wi-Fi network and use that Ethernet connection to access the internet.

In this context, the action of sharing the Ethernet connection via Wi-Fi effectively relays the internet connection from the Mac to other devices, which can include smartphones, tablets, and other computers. This feature is particularly useful for providing internet access to devices that do not have a direct Ethernet connection, allowing them to connect wirelessly through the Mac.

The other options do not accurately describe the functionality associated with Internet Sharing on a Mac. Therefore, the correct choice highlights the capability of transforming the Mac into a bridge for internet connectivity, providing essential community access for devices in its proximity.