Assume a therapist completes this rating scale for a patient today and then completes this rating scale again for the same patient one week later. If the therapist's ratings were the same both times (e.g., 0 or "Lowest Concern"), this would be an example of high _________.
a. convergent validity
b. predictive validity
c. inter-rater reliability
d. internal consistency
e. test-retest reliability