Which metric should be used to set the appropriate threshold?

View the Exhibit. Examine the query on the v$servicemetric view and the output.You wish to define a service-level threshold based on wall-clock time to monitor the performance of the service.
Which metric should be used to set the appropriate threshold?
Exhibit:

View the Exhibit.

Examine the query on the v$servicemetric view and the output.You wish to define a service-level threshold based on wall-clock time to monitor the performance of the service.