What Is the Scientist-Practitioner Model Approach to Understanding and Treating

What is the scientist-practitioner model approach to understanding and treating child psychopathology?

A) Psychological research and clinical practice are important, connected professional activities.
B) Psychological research and clinical practice require professional training, study and specialization.
C) Researchers should disseminate their knowledge of psychopathology to clinicians who can use it to help families.
D) Psychologists should do both psychological research and clinical practice.