Which statement can be inferred from the output of the show ip interface brief command?

The statement that can be inferred from the output of the "show ip interface brief" command indicating that one device is attached to a physical interface is grounded in the command's function. This command provides a summary of the interfaces on a router or switch, including their IP addresses, status, and protocol information.

When the output shows that an interface is up and one device is connected, it implies that there is an active link to a single device on that particular physical interface. This is typically evidenced by the operational status as "up," suggesting that the layer 1 (physical layer) and layer 2 (data link layer) connections are functioning correctly, allowing at least one device to communicate over that connection.

Other interpretations, such as the ability to remotely manage the switch or the interface being down for maintenance, relate to different contexts. Similarly, asserting multiple devices are attached doesn’t align with the information typically conveyed by this command, which focuses on the status of individual interfaces rather than aggregating multiple connections unless specified otherwise. Hence, option A accurately reflects the implication one can derive from the command's output.