Refer to the exhibit. The network engineer is performing end-to-end MPLS path testing with these conditions: - Users must perform MPLS OAM for all available same-cost paths from R1 to R4…

This command includes the `verbose` option for detailed output but lacks the `multipath` keyword, meaning it will only trace one path to the destination, not all available same-cost paths.

This command includes the `multipath` option to discover all same-cost paths but omits the `verbose` keyword, which means it will not provide the required 'all of the next-hop IP details' in its output.

The `multipath` keyword in the `traceroute mpls` command specifically instructs the router to discover and display all Equal-Cost Multi-Path (ECMP) paths an MPLS packet can take, fulfilling the requirement for 'all available same-cost paths.' Additionally, the `verbose` keyword provides enhanced output, including detailed next-hop IP addresses, outgoing interface information, and labels, meeting the condition for returning 'all of the next-hop IP details.'

This command specifies a source interface but lacks both the `multipath` keyword to find all same-cost paths and the `verbose` keyword for detailed next-hop information, thus failing to meet either of the specified requirements.