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The command that can be used to verify if a trunk link is operational at Layer 1 and Layer 2 is the one that displays detailed information about the interfaces on a device, including their status and configuration. This command provides insights into whether the trunk is up and operating effectively by showing not only its physical status but also encapsulation types and allowed VLANs, which are critical for trunking functionality.

Using this command, you can check if the trunk is negotiating correctly, whether there are any issues at the physical layer, and if both ends of the trunk link are properly configured to handle traffic for the specified VLANs. This reinforces the idea that trunk links need to have the correct Layer 1 and Layer 2 configurations to function as expected.

In contrast, the other options serve different purposes. For instance, one option focuses on VTP (VLAN Trunking Protocol) status, which does not address the operational status of specific trunk links directly. Another option shows the running configuration of the device, which may provide useful information but does not give specific feedback on the operational state of the interfaces. Lastly, viewing the VLAN brief provides an overview of VLANs but lacks details on the trunk link's functional status.