The correct answer is D. trace.
The /trace endpoint displays trace information for a specific request. This information can be used to troubleshoot problems with the request.
The /health endpoint displays information about the health of the service. This information can be used to determine if the service is up and running.
The /info endpoint displays general information about the service. This information can include the version of the service, the number of instances of the service, and the load on the service.
The /metric endpoint displays metrics about the service. This information can be used to track the performance of the service over time.